High Speed Steel 1/4" HSS drills available in packs of 10. HSS commonly know as High Speed Steel is used in a variety of tool bits and cutting equipment. It actually cuts material rather than shearing as normal steel can do. HSS makes cutting much faster and easier then then the high carbon steel( hence the name high-speed steel.)
These drills are a an ideal replacement bit for our drill countersinks and drill bit adaptors in our INSTY-BIT range.