Presentation of the hex socket: 6.35 mm hexagon. One head is a 2-pit, two-slot SDS shank, the other is a hex socket. The 60mm black knurled models can withstand greater torque, and the 60mm and 70mm silver models have no knurling. High quality material: chrome vanadium steel, fully formed, durable, reliable quality. Chrome vanadium steel suitable for heavy impact drivers. Spring-loaded ball bearing on the head to hold sockets securely. Easy to use: Flexible shield protects hand from injury when inner shaft rotates. Use a drill bit to bend, twist and turn in a confined space. Product use: It can convert electric hammer, impact drill and other original SDS connection methods into one method inner hex connection, so it can connect all kinds of bit heads, chamfering tools, drill bits and other hex shank tools. Wide application: ideal for woodworking, carpentry, auto parts repair, etc. Nice gift for a handyman. Features: Colors: black and silver. Size inner hexagonal: 6.35 mm. Usage: impact drill and electric hammer. Advantage: impact screwdriver adapter to socket with 2 points and 2 slots, hexagonal socket. Features: Set of 3 adapters for SDS impact screwdriver . Great tools to carry along with a hammer and drill. Perfect for use with SDS drills. Black SDS socket adapter with knurling can handle larger torque, more useful. < /p> Designed for SDS drills with their SDS Plus shanks, and they can also be used on standard drill chucks. Suitable for professional use or for DIY enthusiasts. Note: Due to lighting effects or brightness/mode settings contrast of your screen, slight color variations may appear between the photo on the site and the article itself. 3 pieces: Black SDS socket adapter with knurling: 60 x 13 mm (L x D). Long silver SDS socket adapter without knurling: 70 x 10 mm (L x D). Silver SDS socket adapter without knurling: 60 x 10 mm (L x D). Note: 1. Please allow 1-2mm error due to manual measurement. 2. Do not turn the screws with unmatched size, in case the screws and bits are damaged.