Connection part 3/8"" square head socket to 1/4" 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.

3/8" to 1/4" connection part
With a 3/8" square head socket drive
1/4" external square
With secure socket fixing
Made of chrome-vanadium for high load capacity