Stanley 51-163 16-Ounce FatMax Xtreme AntiVibe Rip Claw Nailing Hammer Patented torsion control grip technology reduces the effects of torque on wrists and elbows Patented AntiVibe technology minimizes vibration and shock at impact Precision balanced - feel the difference. Forged, one-piece steel construction for increased strength and durability Limited lifetime warranty Patented torsion control grip technology reduces the effects of torque on wrists and elbows Patented AntiVibe technology minimizes vibration and shock at impact Precision balanced - feel the difference. Forged, one-piece steel construction for increased strength and durability Limited lifetime warranty