Microstop Countersink, 1/4" Shank, 1/4x28 Female Thread. Fits any air or electric drill. Accepts rivet shaver bit or pilot cutter up to 1/2" diameter. Overall length: 2".
#12 Pilot, 1/2" Diameter. 1/4x28 Thread. 3 flute, 100 degrees. Integral (fixed) pilot for cutting accuracy. Suitable for 3/16" riveting, or 10-32 AN507 Screws. High Speed Steel.
Our heavy duty microstop uses ball bearings for ultra smooth operation. The ball bearing design also makes it run much cooler than a standard microstop. Depth adjustable in 0.001" increments with positive locking collar. Shaft travel is 9/32".