Quick release system brings great speed on work by using the switch, the user will not need to remove the wrench head from the workplace. Designed for use on 6 and 12 point tube fittings, fasteners, valves and compression fittings. Black finishes are oil-based and are non-reflective, corrosion-resistant. Exceed ASMEE B107.100 standard. Opening size: 5/8″. Length: 7-1/4″.