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TUNGSTEN CARBIDE TIPPED: A brazed tungsten carbide cutting tip on a high speed steel body, for hard materials that quickly blunt ordinary HSS drill bits. FOR HARDENED STEEL: Ideal for hardened steel, security plates, high-tensile bolts and locksmith work. For stainless steel, use a cobalt drill bit instead. SLOW AND STEADY: Made for slow, controlled drilling. Keep the speed low with firm, steady pressure and hold the drill straight, as a tungsten carbide tip can chip if the drill wanders. SIZE: 4.0mm x 66mm, sold as a single bit, with a straight round shank that fits a standard drill chuck. FOR A CLEAN HOLE: Centre punch the mark and clamp the work so it can't move. Use a pillar drill if you can, and cutting fluid on steel so the tip lasts.