1-3/16" Silver & Deming HSS鑽頭

The 1/2" shank with those three flats grips my drill chuck like a vise—zero slipping even at full torque. Punched through half-inch plate steel cleanly, and the hole came out perfectly round. Solid buy for the price.

I needed to drill a 1-3/16" hole in some thick steel plate, and this bit with its 1/2" shank and three flats held rock solid in my chuck without slipping. It cut through smoothly with steady pressure, and the hole was clean.

I was impressed how the three flats on the shank kept it from slipping even under heavy load. Cut through thick steel plate without any chatter.