Teng Tools impact sockets and accessories are specifically designed for use with power tools and air tools. Manufactured in chrome molybdenum in accordance with GGG-W-6608, these sockets ensure the highest quality. Adaptors convert sockets of one size drive to another. They consist of a male drive fitting of one size attached to a female drive fitting of another size. This Teng Tools impact adaptor has the following specifications:Female drive: 1 inch.Male drive: 3/4 inch. Ref: UTTK12823