4 Pack Stanley 51-163 16-oz FatMax Xtreme AntiVibe Rip Claw Nailing Hammer Smooth Face - 13/1/2" Length Patented torsion control grip technology reduces the effects of torque on wrists and elbows Patented AntiVibe technology minimizes vibration and shock at impact Magnetic Nail Start feature for extended reach and one-handed nailing capability Precision Balanced - Feel the Difference Forged, one-piece steel construction for increased strength and durability