Neiko 10050A HSCO Spot Weld Drill Bit Set, 3 Piece, Titanium Coated Drill bits are made from a high speed cobalt blend that makes it a great option for drilling into harder steel materials Titanium coating on the drill bits not only prevents bit dulling for extended performance life but also offers smoother drilling The flat shaft is made for a sure grip and special centering nib design avoids slipping Set comes with handy aluminum, sponge cushioned case for snug and safe storage Set includes: 3 piece set comes with 6.5mm (1/4"), 8mm (5/16"), and 10mm (3/8") drill bit that are clearly labeled both on the drill bit and case