5/32" cut diameter. decimal equivalent- .1563 flute length-2" 6" overall length, high speed steel, Aircraft Extension drill bit. These drills are manufactured to National Aerospace Standard 907. They have a 135 degree split point that is self centering which reduces thrust. These drills are ideal for drilling in mild steel where extra lingth for reach is required. They have a black oxide surface treatment that is avrasion resistant, which also reduces chip welding and improves chip flow. Sizes smaller than #52 and 1/16" have a standard 118 degree point.