Air Capital Microstop and Countersink Kit, Model# 65001 [Misc.] [Misc.] Microstop has a nylon tip to reduce damage to sheet metal Rated for 3000 RPM Has 5/8in cutter capacity Accepts standard 1/4in-28 threaded countersinks Includes 3/32in, 1/8in, 5/32in, 3/16in and 1/4in 100 countersinks