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

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