Dremel 631 Brad Point Bits, 4 Pieces Compatible with all Dremel rotary tools. Titanium coated brad points stay on center and begin drilling immediately. High-speed drill bits ideal for drilling into wood. Now drill holes up to 1/4" diameter Includes bits for 1/8", 5/32", 3/16" and 1/4" (1/8" Shank on all bit sizes).