RAY TOOLS LOW TORQUE 3", 3.5", AND 4" KNOCKOUT PUNCH AND DIE SET Dies rated for 10 gauage stainless steel 3" punch set requires just 30lbs of force compared to competitors 80lbs Use with Greenlee, LH Dottie or other hydraulic and manual punch tools Conduit pipe sizes 3", 3 1/2", and 4"