Each product within the Milwaukee knockout system was built upon the principles of reducing the tedious steps of hole making, improving the speed of the process, and limiting the fatigue of the user. The EXACT 1-3/8 in. sink knockout set carries these benefits forward to the contractor punching holes in stainless steel sinks. The hand ratchet, in combination with EXACT sink punches and dies, is robust enough to punch up to 1-3/8 in. holes in 16 gauge stainless steel. A 20% longer handle gives contractors greater punching leverage. The EXACT sink punches and dies are rated for both mild and stainless steel punching. Plus, EXACT dies have engraved cross hairs for accurate alignment. Altogether, the EXACT 1-3/8 in. sink knockout set is another example of how Milwaukee's knockout system truly is the easiest way to punch!