HHIP 7 Piece Optical Punch Combination Kit Punch set includes 7 components: a bullseye lens, a cross hair lens, a 150 degree center punch made of tempered steel, a 60 degree center punch made of tempered steel, a precisely manufactured aluminum main body, an auto center punch 6" long double spring loaded barrel and a fitted storage case. Punch size is 3/8". Pin length is 1.85". Acrylic lens magnifier power is 9x. Allows you to punch layout points within .002" of location easily. Even the inexperienced can punch accurate holes every time with this set. It is indispensable when doing critical layout work. It is also ideal for metalworking, woodworking, jewelry making, and other precision crafts. Just look down the magnifying lens and align the cross hairs with the mark on your work piece. Replace the magnifier with the supplied punch and give it a tap. The cork bottom helps to provide stability and grip. It reduces slippage and ensures that the center punch remains in position while marking the material accurately.