Alloy steel forgings: provide maximum durability - Four bolt back head design: stands up in rugged use - Quick change latch type forged retainer: simple change of chisel - Hex shank: possible to use asphalt cutters and spades - With optional muffler and anti-vibration handle Piston Diameter ( mm ) / 57.15 Piston Stroke ( mm ) / 100 Blow per min. ( b.p.m ) /1,400 Net Weight ( kg / lb ) / 30 / 66 Overall Length ( mm ) / 645 Air Consumption ( m3/min) / 2 Air Hose ( mm ) / 19 Air Inlet Size ( pt ) / 3 ⁄ 4 Shank Size ( mm ) / 1-1/8 x 6