Features: The package includes 3pcs drill bit of 1/4in (6.5mm), 5/16in (8mm), 3/8in (10mm) to meet different requirements. 1/4" and 5/16" and 3/8" cutting diameters,made of cobalt-containing material; Great for removing welding spot. HSS-CO drill bit has wide range of uses, easy to carry, fine workmanship; It is a good helper for car maintenance; Specifications: Material:High-speed Steel(HSS-CO Cobalt) Titanium Coating Drill Bits; Length:Approx.45mm /1.8in Size:1/4in (6.5mm), 5/16in (8mm), 3/8in (10mm). Package Includes: 3pcs Cobalt Drill Bits note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.