About This SPECIFICATION: 2PCS impact socket adapters: include 1/4" F to 3/8" M adapter and 3/8" F to 1/4" M reducer set. Our products have clear laser markings for easy identification and management. Provide you with the size you need for a smooth transition between sockets PREMIUM CR-MO MATERIAL: The socket adapter is made of heat-treated forged Chrome Molybdenum Steel, it's corrosion-resistant and has ultra-high hardness. The thicker wall design can handle higher torque and prevent breakage PREMIUM COATING: Our socket adapter set has black manganese phosphate coating on surface, which is better than the traditional black oxide coating adopted by others. Black manganese phosphate coating is a quality corrosion resistance and rust resistance function, reduces friction with other fasteners and ensures maximum durability SRING BALL DETENT: This impact reducer set is furnished with spring ball detent, capable of tightly linking with the socket and preventing any falling, ensuring smooth operation and safety during use DIVERSE APPLICATION: It can flexibly connect sockets and wrenches of different sizes, greatly enhancing the tool's versatility. During maintenance and repair, it makes the work more convenient and efficient. It can meet the needs in various scenarios, such as industry, family, or DIY, and play a crucial role Overview Color : Black Brand : BLACKROBOT Finish Type : black manganese phosphate coating Item Weight : 0.04 Kilograms Item Package Quantity : 1