Each socket adapter is constructed of heat treated vanadium steel and black oxide coated, and with stand torque compression and superior strength which is accordance with the standard operating conditions. This impact extension and adapter set includes drill socket adapter (8pcs)and reducer set(4pcs) Professional and precise size makes it compatible with most brands of power drills and screwdriver handle tools. Specific impact grade design made exclusively for drivers and wrenches, spring loaded ball bearings on each square head securely and locks into sockets to avoid slippage during using. Compact and portable, this set is a must-have for professionals and DIY enthusiasts, making them ideal for heavy-duty and high-torque applications.perfect for automotive, mechanical, and construction projects., Weight: 0.110231131 pounds, Manufacturer: MAHUDVCR