Label:Yes 1/4 "(F) drive tool to 1/2" (M) drive socket, small fly big fly. The notch on the drive end is combined with the ratchet and extension, making it ideal for any industrial, mechanical or construction job. The whole body is chrome-plated with an anti-slip spring ball and an anti-slip slot to provide a secure support for the sockets and prevent them from falling. Suitable for hand tools, electric or pneumatic tools are not recommended. Made of chromium-vanadium steel with a chromium-plated surface for added durability and corrosion resistance. Package Content: 1pcs Small Fly Sleeve Wrench Interface Reducer Mainly to improve the hole machining accuracy, reducing the surface roughness, is used for hole finishing and semi-fine processing tool.