Diablo Metal Demon Drill Bits and Diablo Hole Saw FAQs: A Shop Buyer's Honest Answers

I'm the one who signs off on tool orders for a 14-person contracting shop. If a tool doesn't pay for itself, I usually hear about it before the invoice is paid. The crew knows I won't approve everything just to keep the peace. They also know that if they show me a job-history report, I'll listen.

This FAQ started from real questions around the shop. Some are about Diablo cutting tools. Some are about repairs that get blamed on tools but actually come down to simple installation mistakes, like a sump pump weep hole in the wrong spot or a hose clamp that was never really locked. They all end up in the same place: my cost report.

Are Diablo Metal Demon drill bits worth the premium price?

Short answer: for real metal work, yes. For one hole in soft steel every few months, maybe not. That sounds like a compromise, but it's the only useful way to answer. I compare cost per hole, not price per bit.

When I audited our 2024 consumables, the replacement pile of cheap bits was big enough that a higher-quality bit would have paid for itself. Diablo Metal Demon drill bits start without walking and keep cutting after ordinary bits are done. That means fewer ruined holes, fewer trips to the supply house, and less time standing around watching someone fight a dull bit.

The most frustrating part of buying cheap is that it never feels like a mistake on the day you buy it. It feels like a mistake at the end of a 20-hole run when the crew is still on hole six. The extra cost shows up in the job profit, not in the purchase order.

Which Diablo hole saw should I put in the truck first?

Don't buy a giant kit because the price per piece looks smart. A kit is only smart if you actually use most of the sizes. For the shop I manage, a 7/8-inch and a 1-1/8-inch Diablo hole saw cover most conduit and cable openings. I add sizes when a recurring job proves the need.

There is no one Diablo hole saw that cuts everything. If you're mostly cutting wood and plastic, a standard hole saw from a solid brand is enough. If stainless steel shows up on the schedule regularly, the carbide-tipped version earns its spot. Buying the right tool for one material is not overspending. It's the difference between a clean cut and a burned-up hole saw that costs you a redo.

Is a 32 inch PowerGear2 lopper worth it for a working crew?

I know this one looks out of place in a power-tool accessory article. But maintenance and site cleanup change the tool list. A 32 inch PowerGear2 lopper saves time because it lets one person handle branches that would otherwise mean getting out the recip saw or finding a second pair of hands.

I waited two years before approving one. I thought it was a specialized homeowner tool with a gear system I wasn't going to use. Then I watched a guy fight a 1-1/2-inch branch with the wrong tool for twenty minutes. The 32 inch PowerGear2 lopper cut it in one clean squeeze. If you do that kind of work often enough, buy it. If you don't, borrow one and save the space.

What is a sump pump weep hole and where does it go?

A sump pump weep hole is a small hole, usually 1/8 to 3/16 inch, drilled in the discharge pipe between the pump and the check valve. It gives trapped air an exit and lets the short section of pipe drain back into the basin after the pump shuts off. If a pump runs but pushes no water, an air lock is often the reason, and this tiny hole is the fix.

Location matters. Most installation manuals show it below the check valve, not above it. Some pumps already come with a built-in weep slot, so check the pump and the manual before drilling anything. Adding a second hole when one already exists is not as harmless as it sounds. Drilling into the wrong part of a plastic fitting can turn a $200 pump job into a $500 service call.

How to lock a hose clamp and keep it that way

First, figure out what kind of clamp you are dealing with. A worm-drive clamp locks when the screw threads hold the band in place. If it keeps backing off, the problem is usually size, not torque. A clamp near the end of its adjustment range will vibrate loose no matter how hard you crank it. Replace it with a clamp that sits comfortably in the middle of its range.

For spring clamps, use locking hose-clamp pliers. The ratcheting pliers grip the clamp ears, compress them, and hold the clamp open while you position it. Once the clamp is over the hose, release the pliers and let the clamp's tension do the work. Do not try to hold it open with your fingers. That is a pinch injury waiting for a place to happen.

If the hose clamp has a locking tab or a one-time crimp ear, make sure it snaps or crimps fully. A half-locked clamp feels tight until it finds the worst moment to let go. And if the manufacturer lists a torque spec for the clamp, use it. On some hoses, overtightening makes leaks worse by distorting the fitting.

Does a pro brand mean you should never buy cheap tools?

No, and I won't pretend otherwise. I've said no to a premium tool because the job didn't justify it. I've also said yes because I counted the rework from the cheap option. The rule I use: multiply the price by how often the tool fails, then add the cost of the time it takes to handle the failure. If that cost is low, buy cheap and move on.

That's why I don't mind telling someone a Diablo accessory is not the right answer for every job. A specialist earns trust by knowing the boundary. If the vendor says it can do everything, that is a red flag. If it tells you when a standard option is enough, you believe it when it says the serious option will save you money.

How many spares should be in the van before a job?

I use a simple 30-day rule. If a crew uses a size or a type three times in a month, it belongs on the truck. If it sits unused for sixty days, question it. That applies to drill bits, hole saws, and even the 32 inch PowerGear2 lopper mentioned above. It sounds obvious, but most vans I've checked were full of supplies for a job that happens once a year.

Stock is a cost. A bit that sits in a bin isn't earning its space. The goal is to be ready without being a warehouse. If you review the list every quarter, your tool budget will tell you what the crew actually needs.