1/2" TO 3/4" COUPLER -STANDARDS: NF ISO 3316, ISO 3316, DIN 3123, ASME B107.10 -1/2 female to 3/4 male square drive with plunger. -For adapting sockets and accessories 3/4. -Male square drive with plunger for positive locking of sockets and accessories. -Finish: satin chrome.