General description This set of increasers and reducers allows you to mix and match drive sizes for your sockets, ratchet handles, extension bars, and other accessories. Technical specifications 1/2" to 3/8" - (12.5mm square hole to 9.5mm square head), Length: 36mm 3/8" to 1/4" - (9.5mm square hole to 6.3mm square head), Length: 27mm 3/8" to 1/2" - (9.5mm square hole to 12.5mm square head), Length: 35mm 1/4" to 3/8" - (6.3mm square hole to 9.5mm square head), Length: 26mm Hardness: 60HRC Height: about 26mm, 27mm, 35mm, 36mm Content: 4pcs Increaser and Reducer Adapters Other information The data is manually measured; please allow for a 1-51cm error. Due to differences between light and screen, there may be a certain color difference; the specific received item prevails.