ITEM NAME:13x HSS Titanium Coated Twist Drill Bit Hex Shank 1.5-6.5mm High Speed Steel.Titanium coated HSS drill set with standard 1/4" hex shank that will fit cordless screwdrivers, drills etc or use in standard drill chuck. 13pcs x HSS drilling bits (1.5mm-6.5mm). The 1/4" hex shank is specially designed for cordless screwdrivers, enabling you to quickly change drill bits.