PROTO 12 PIECE PUNCH & CHISEL SET MADE FROM S2 STEEL AND SPECIALLY HEAT-TREATED FOR GREATER STRENGTH AND DURABILITY. MODIFIED PARABOLIC STRIKING END TO HELP REDUCE MUSHROOMING AND CHIPPING. BLACK OXIDE FINISH TO HELP PREVENT RUST CORROSION; EXTENDING TOOL LIFE AND PERFORMANCE. A POLISHED IDENTIFICATION PANEL ON ONE OF THE FLATS IS MARKED WITH THE TOOL NUMBER AND SIZE IN A BLACK INLAY. SET OFFERS A WIDE RANGE OF SIZES TO HANDLE A VARIETY OF JOBS. INCLUDES A POUCH FOR CONVENIENT STORAGE SOLUTION.