Hss tct tip drill bit 2.0mm ol51mm wl24mm irwin 10502671, the irwin metric tct tungsten carbide tipped drill bits offer precision drilling with stationary machines in hardened steel, cast iron, bronze alloys and manganese alloyed steel'. '.strtoupper('t')he c2 carbide tip will drill hardened material up to a hardness of 50 rockwell c and is four facetted ground for low drilling pressure and perfect centring'. '.strtoupper('t')he body of the drill bit is made from chrome vanadium steel, hardened to 56 rockwell c'. '.strtoupper('a') coolant should always be used when drilling with tct twist drill bits'. '.strtoupper('i')rwin suggest the use of a 3 6% emulsion'. '.strtoupper('t')he coolant will extend the lifetime of the drill bit.irwin hss tct tip drill bit'. '.strtoupper('s')pecificationsdiameter 8.0mm.total length 177mm.working length 75mm'. '.strtoupper('i')rwin® 10502671 hss tct tip drill bit 8.0mm ol117mm wl75mm