5PCS Countersink Drill Bit Set, High Speed Steel Countersink Bits, 82 Degree 5 Flute Pieces, 1/4 Inch Hex Shank, Fit for Sink Holes into Metals, Wood, Plywood, Plastic

Great Value for the price. Sharp too. I regularly machine aluminum and use these for deburring holes as well as countersinking holes. I was afraid that the cost would equate to cheap garbage, but they have proved sharp and useful.

I had to drill a few drain holes in a porcelain pot. The drills cut through without chipping the paint, no binding. It left a perfect hole.

Worked great for hard concrete wall mounted a wall heater.

This is an excellent set of masonry drill bits. There is a variety of sizes in a case that stays shut when not in use. I used to drill a concrete fireplace and it took no time at all. This is an excellent, well made item that works as advertised at an affordable price.

Good

They work great

These drill bits are great. I start with the smallest one and then use the larger ones to get to the correct hole size. You do need to keep dipping the drill bit into some water to keep it cool, however, and doing that, they work great.

The 1/2” bit broke on the very first drilling