3Pcs HSS CO Cobalt Spot Weld Drill Bit Set Weld Cutter Parts 1/4in 5/16in 3/8in
Material: HSS CO Cobalt Material. - High speed Cobalt bit, Titanium coating prevents bit dulling from overheating. - Flat shaft for sure grip, special centering nib design to avoid slipping. Color: As the picture show.