The Snap-on 4-pc Heavy Duty Spring Punch Set, No. SPHDSET4, utilizes a patented spring and plunger combination, eliminating the need for a hammer and reducing the risk of injury. The unique design delivers accurate blows with up to 5,000 psi impact force on the toughest materials. Knurled shanks give techs a better grip for precision control, even when using gloves. The 4-pc set includes a transfer punch, cold chisel punch, center punch and pin punch.