Ratchet Adapter Set Includes ---4 Pieces 1/4 to 3/8 Socket - 3/8 to 1/4 Inch - 3/8 to 1/2 - 1/2 to 3/8 High Quality --- Extension adapters are made of chrome steel. Adapters and reducers are made of premium high-strength chrome steel with a manganese phosphate coating to help resist rust and corrosion and ensure a lifetime of use. General Purpose --- This screwdriver extension bar set for hex shank screwdrivers is designed to meet a variety of needs. Provides versatility and convenience, regardless of the tool you have chosen to use. Purpose --- Spring-loaded ball lock ensures a tight fit in the driver head to prevent slipping during use. Specially machined to fit securely into a hand screwdriver, drill wrench or impact wrench.The ball bearing ch. 1/2" to 3/8" - (12.5mm square hole to 9.5mm square head) Length: 36.6mm 3/8" to 1/4" - (9.5mm square hole to 6.3mm square head) Length: 25.9mm 3/8" to 1/2" - (9.5mm square hole to 12.5mm square head) Length: 36.8mm 1/4" to 3/8" - (6.3mm square hole to 9.5mm square head) Length: 26.7mm Number of products: 4 pieces Color: silverladacee