Set of 13 professional drill bits: 1.5 mm, 2 mm, 2.5 mm, 3.2 mm, 3.5 mm. 62.6. cm), 4 mm (5/32'), 4.5 mm (11/64'), 4.8 mm (3/16'), 5 mm (13/64') , 5.5 mm (7/32'), 6 mm (15/64'), 6.5 mm (1/64'), 6.5 mm (1/32') . 10.2mm. cm) High-quality material: The drill bits are made of high-speed steel with titanium coating, which has super heat resistance and long service life. Replace quickly Drill: 6.35mm hex handle is suitable for all power tools, which is easier/convenient and safer to use. It is suitable for electric screwdrivers, drill bits, etc., or for standard drill chucks. Smooth drilling: Designed as a 135° cutting angle, which can automatically center and penetrate quickly with a small pressure. Threaded chip flutes can remove chips and debris faster. All twist drill bits support worry-free after-sales service. We provide high quality products and timely after-sales service. Long life and durability with steel material high quality quick change. Equipped with a 6.35mm hex shank and