PROMAX USA Chrome and Impact Sockets & Accessories are widely recognized and quoted as the standards by which others are judged. Made to exacting specifications, the design, materials and processes are painstakingly monitored to ensure you have the best. Our much applauded IMPACT range is forged from chrome-molybdenum alloy steel, renowned for its strength and durability. The integrity of which is assured in our drop-forged process and precise application of heat and surface hardening treatments to deliver sockets for maximum material strength, hardness and surface durability. PROMAX Impact Sockets are made according to Federal Specifications GGG-W-660A and DIN 3121 and 3219.