Wera 042673, 781 B 3/8" Connection parts, 781 B/C x 1/2 x 36 mm x 3/8"

Connection part 3/8" square head socket to 1/2"external square head. For manual and machine-operated tools (non-impact), with ball stop groove to safely lock the socket, knurling at the rear end for manageability during manual use; chrome-vanadium, dull chromed.