Microstop and Countersink Kit Click HERE for more information! 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.