Snap-on Punch and Chisel sets, Nos. PPC715BK (16-piece) and PPCSG710 (10-piece), are made from special alloy steel heat-treated for toughness. The 16-piece set features a parabolic curve that controls mushrooming to reduce chipping and splitting. Design directs the striking force to the center of the tool head to allow slow metal displacement. The 10-piece set features ergonomic soft-grip handles, semi-spherical striking area controls mushrooming, cutting edges on chisels are hand ground to consistently produce a quality cutting edge.