High quality: Socket adapter is heat treated vanadium steel and is black oxide coated. Tripod torque compression and superior strength meets standard operating conditions, made of high quality chrome-molybdenum steel with manganese phosphate coating to resist rust and corrosion and last for a long time. Universal: 1 or 4 inch hex shank fits all quick-change chucks Perfect size makes it compatible with all brands of drills and screwdriving tools. Suitable for all types of ratchets, ratchets, socket wrenches, torque wrenches, handles, etc. Products include: includes 3 piece 1 or 4 3 or socket wrench nut set 8 or 1 or 2 inch and a 4 piece socket adapter 1 or 4 to 3 or 8 - 3 or 8 to 1 or 4 inch - 3 or 8 to 1 or 2 - 1 or 2 to 3 or 8 Unique design: special impact class design designed exclusively for screwdrivers and wrenches, spring-loaded ball bearings on each square head and locks into bushings to prevent slipping during use. Ideal tool: offers versatility and comfort, whatever tool you use. Ideal for DIY, household maintenance and most general repairs, not for industrial work. A great addition to any set of tool boxes. Feature: These steel extension arms heat treated chrome vanadium with black oxide coating are high quality, durable, corrosion resistant and suitable for a long life. Get the most out of your electrical outlets with this Convenient set of adapters and reducers to ensure you always have the right size for the job. The 1 or 4inch hex handle fits all standard quick-change chucks and drill chucks. It can quickly convert any drill press into a socket wrench for quick clamping or quick removal. It can turn the hammer drill into a high-speed screwdriver. Suitable for all types of ratchets, ratchets, socket wrenches, torque wrenches, push handles and rockers. 3-piece Drill sleeve adapter, size: 1 or 4x1 or 4x50mm length- - - 1 or 4inch shank can be converted 6.35mm square head Length 3 or 8x1 or 4x50.8mm - - - 1 or 4inch shaft can be converted to 9.4mm square head 1 or 2x1 or 4x50mm length - - - 1 or 4inch shaft can be converted to head 12.6 mm square In 4 parts Impact adapter set size: Reducers of 3 or 8 in (F) to 1 or 4 in (M) 1 or 2 in (F) reducer to 3 or 8 in (M) reducer Adapter for 1 or 4 inch drive (F) to 3 or 8 inch drive (M) Adapter for 3 or 8 inch drive ( F) to 1 or 2 inch drive (M) Ress ball head lock design ort: This head construction can securely lock sockets while the through holes in the drive end of adapters and reducers engage the drive spindle. High Quality Material: Each socket adapter or reducer is made from chrome vanadium steel, heat treated by black oxide coating and works good when it can withstand normal torque compression. 1 or 4 inch hex shafts: This size fits all hammer or drill chucks. Turn a power drive into a high-speed screwdriver. Quantity Shipped: 7 pieces