High Speed Steel Fractional Self Starting, 1 4 in to 3 4 in, 9 Steps no checkout Curved jaw puts tremendous pressure Curved jaw puts tremendous pressure on four points of any style nut or bolt head Includes convenient wire cutter Constructed of high grade heat treated alloy steel for maximum toughness and durability Guarded release trigger quickly unlocks and protects from accidental release Turn screw to adjust pressure and fit easy change outs plastic and laminates Single flute cutting edge for greater control through steps Hex shank prevents slipping in drill chuck Also available with (TiN) coating for longer life New SpeedPoint tip penetrates faster than previous Unibits and prevents walking Ideal for drilling holes into thin materials such as stainless steel