Features Use compressed air as power to tighten or loosen bolts and nuts. Compact size and light weight, ideal for tight spaces. Lever control for easy use and variable torsion adjustment. Easy to operate, good mechanical performance. Suitable for shipbuilding, machinery manufacturing and auto industry and other fields. Specification: Material: Aluminum alloy & Iron & Steel Weight: Approx. 450g/15.9oz Square Drive Size: 1/4", 3/8" (Optional)(default send Japanese air inlet connector) Speed: 300rpm Gas consumption: 3.0cfm Torsion: 16ft-lbs    Inlet connection: 1/4"(default send Japanese air inlet connector) Speed: 300rpm Air pressure: 90psi  Rotation: positive and negative rotation Overall Length: Approx. 16cm/ 6.3in Package List: 1 x Pneumatic Air Ratchet Wrench 1 x 1/4" Inlet Connection Package List