Proto J5122 Features

• Designed for easy torque calculations
• Adapters measure 2″ from the center of the square drive to the center of the adapter opening
• Special heat-treated alloy steel helps to increase strength and durability
• Box end wall thickness is specially engineered to provide strength while still allowing ample room for access to reach difficult fasteners
• 12 point box end allows for fine indexing, helping to improve speed and access. Fits 4, 6 and 12 point fasteners.