The P-540 takes over where the P-500 leaves off, cutting up to 14 gauge cold rolled steel, most grades of stainless steel to 20 gauge and aluminum to .090. Its variable-speed trigger lets you make smooth, easy starting cuts even in most grades of stainless up to 16 gauge. The 4 pound, pistol grip, 2200 RPM pneumatic motor, runs on a 90 PSI power source. A great time-saver in any construction company, sheet metal or sign shop.