Free speed:4600RPM Bolt capacity:33mm Max torque:1600N.m Air inlet:3/8" Air pressure:6-10kg Anvil length:1.5" Moment bound:500-1400N.m 1.twin hammer mechanism 2.directional smelting manufacture,light and durable, high power. 3.easy adjustable power regulator 4.ideal for general repair on cars, tires and heavy equipment.