Metal drill bits hss co din 338 the expert for hard tough steel a precision ground right hand cutting twist drill bit made of high speed steel ground from solid metal safe pilot drilling without pre punching and high true running precision make this drill bit stand out suitable for alloyed and non alloyed steel stainless steel v2av4a and cast iron also available as a set only use with coolant self centring drill bit tip with 135 split point manufactured to din 1412 c drill bit