Beta Tools 27mm Box End Interchangeable Head for Torque Bar - BT 6520027Beta Tools 27mm Box End Interchangeable Head for Torque Bar BT 6520027 The box end interchangeable head is a removable attachment that fits onto the end of a torque bar or torque wrench. The box end design resembles a closed end wrench with a fully enclosed, ring like shape that provides more contact points on the fastener. Specifications: Overall Length: 71mm Torque Size: 27mm LA Size: 32mm (Refer Drawing Image) A Size: 41. 5mm (Refer Drawing Image)