The time-saving TURBOSHEAR Original Model No. TS1 inserts directly into the chuck of a standard 1200 rpm A/C or cordless drill. It’s that easy to convert your power drill to a power shear! This rugged but inexpensive accessory cuts straight and to the left and is capable of navigating tight curved patterns and squares in heavy 20-gauge (1.02 mm) galvanized steel. Blind cuts require only a 1/2”(12.7 mm) starting hole.