General description The HSS Twist Drill Bit Set includes 13 professional drill bits ranging from 1.5mm to 6.5mm, designed for drilling into wood, metal, and plastic. Each bit features a titanium coating for enhanced durability and heat resistance. Technical specifications Material: High speed steel with titanium coating Sizes: 1.5mm, 2mm, 2.5mm, 3.2mm, 3.5mm, 4mm (5/32), 4.5mm (11/64), 4.8mm (3/16), 5mm (13/64), 5.5mm (7/32), 6mm (15/64), 6.5mm (1/64), 6.5mm (1/32) Compatibility and accessories 1/4 hex handle compatible with all power tools Suitable for electric screwdrivers and drill chucks Installation Easy to replace in power tools Usage Designed for smooth drilling with a 135° cutting angle for automatic centering Threaded chip splines for faster removal of splinters and debris