Pro 150 Line 150 Line® Exceptional, Reliable, Tough — The Essence of an American Legacy To celebrate our 150-year legacy of quality, Mayhew has released The 150 Line; a unique collection of professional-grade tools, crafted with the same knowledge and expertise that has made Mayhew one of the industry’s best. High-grade S-2 steel for superior tensile strength, toughness, and long life. Full shank heat treating to reduce mushrooming. Parabolic head to reduce chipping of struck end. Professional black oxide finish for enhanced corrosion resistance. Full, unconditional lifetime warranty* 150 Line Chisels 150 Line Punches 150 Line Sets