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