SHEFFIELD Cr-Mo 3/4″ DR. Adaptor from Female 3/4″ to Male 1/2″ Drive Universal Black Steel Socket Heavy Duty Adapter 转换头3/4″ In. driveBody cold-forging process with high quality CR-MOManganese phosphate surface treatment, anti-corrosionFor the conversion of ratchet and different socketsPRODUCT DETAILS:DRIVE F (A): 3/4″SQUARE HEAD (B): 1/2″  Show More Show Less