Quantity: 3 piece set Colours: Black and Silver. Hexagon size: 6.35mm. Uses: Impact drills and electric hammers. Benefits: 2-slot 2-point nut impact wrench adapter, hex socket. Hex socket introduction: 6.35mm hex . One head is a 2-hole, two-slot SDS shank and the other is a hex socket. 60mm knurled black model can handle more torque, 60mm and 70mm silver models are not knurled. Premium Material: Chrome vanadium steel, fully formed, durable quality and reliable. Chrome vanadium steel for heavy duty impact drivers. The head is fitted with spring-loaded ball bearings to securely hold the sleeve. EASY TO USE: A flexible shield protects hands from injury as the inner shaft rotates. Use the drill to bend, twist and turn in tight spaces. Product Use: It can convert the original SDS connection method, such as electric hammer and impact drill, to the hexagonal connection method, and can connect various drills, tool cutters, drills and other tools with hexagonal shank. Wide range of applications: suitable for carpentry, carpentry, car parts maintenance, etc. Great gift for a DIYer.