Stanley FatMax Antivibe All Steel Curved Claw Hammers - Stanley FMHT1-51277, The Stanley FatMax Antivibe All Steel Curved Claw Hammers have a one-piece forged construction for durability and balance.The hammers have an Antivibe tuning fork to dampen vibration and a soft grip for comfort and control.Weight: 570g (20oz). Stanley FMHT1-51277 FatMax Antivibe All Steel Curved Claw Hammer 570g (20oz)