Product Features DURABILITY: Made of heat treated chrome vanadium steel ( CR-V ) with a protective black oxide finish, superior strength, anti-corrosion and rust. UNIQUE DESIGN: Beveled drive ends help guide adapter or reducer smoothly onto drive tool. Four detent grooves provide a secure connection with the drive tool DETENT BALLS: Detent ball on each adapter end provides a secure fit into the socket, providing support when used with high torque impact rated drivers. Spring-loaded detent balls securely latch onto sockets, preventing them from being dropped SIZES: This set includes a wide array of adapters and reducers. It will add great versatility by including the following conversions and sizes: (3/8 inch to 1/4 in) (1/2 in to 3/8 in.) (3/8 in to 1/2 in) (1/4 in to 3/8 in) Product Specifications Manufacture Country: China sizes: (3/8 inch to 1/4 in) (1/2 in to 3/8 in.) (3/8 in to 1/2 in) (1/4 in to 3/8 in) Package Included Socket Convertor Adaptor Reducer 1 Set Note: Due to manual measurements and slight color variations, please allow 1-3 cm (0.4-1.18 inches) difference to suit different display settings. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.