Check the listing for details. Professional quality dead blow hammer - 20mm. Condition: New. Listed at 26.29 USD. Use to strike metal to bend, form, forge, flatten and shape. The dead-blow with shot increases the power of the strike while reducing recoil. Also known as a shot hammer. Head Weight: 5.8oz Head Material: Nylon Head Diameter: 20mm Hickory Wood Handle User Instructions Grip the work piece firmly in pliers or other holder. Hold piece against a solid backing, such as a bench block, and strike the piece with the hammer to receive desired affect.