Nupla 6894285 Soft Face Sledge Hammer Steel, Fiberglass Handle, 10 lb Head Wt, 2 5 8 in Dia, 32 in Overall Lg G3012697 It has an on off switch It has an on off switch with a built in thermostat that lets you set the temperature at which it operates Bleach Solution (10% Dilute) and soft steel 54 Features Rockwell 30 RHC Head Handle Color Black Handle Design Ergonomic Tether Style Standard Tool (Accessory Needed for Tethering) Replaceable Handle No Face Material Soft Safety Steel Tether Ready No Striking Surface Hardness 30 HRC Dead Blow Hammer No Hammer Type Sledge Hammer Series Ergo Power Face Texture Smooth Non Sparking No Grip Material Rubber Face Shape Round Grip Style Ribbed