Our step drill bits are then coated with titanium for superior durability. 4 ~ 32mm (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm), 6.35 mm shank. - Material: HSS. PROFESSIONAL GRADE STEP DRILL BITS - High-speed step drill bits are a necessity for anyone completing professional or DIY projects.
eBay