Item Type:Socket Adapter Material: Chrome Vanadium Steel Appearance Treatment: Chrome Plating Sleeve Specifications: 1/2in to 3/8in--(12.7mm/0.5in quadrate hole to 9.53mm/0.4in quadrate head) 3/8in to 1/4in--(9.53mm/0.4in quadrate hole to 6.35mm/0.3in quadrate head) 3/8in to 1/2in--(9.53mm/0.4in quadrate hole to 12.7mm/0.5in quadrate head) 1/4in to 3/8in--(6.35mm/0.3in quadrate hole to 9.53mm/0.4in quadrate head) Wrench Extension Specifications: 3/8in to 3/8in (9.53mm/0.4in quadrate head Connected to 9.53mm/0.4in quadrate head) Package List 5 x Socket Adapter Match the Appropriate Size Before Use, and Do a Good Job of Safety Protection 1LONG SERVICE LIFE: The appearance of the socket adapter is chrome plated, which is durable and wear resistant, and has a long service life 2A VARIETY of SIZES: The socket adapter has a variety of handle diameter conversion sizes, which can meet your daily needs 3SIMPLE OPERATION: Installation is simple and convenient, the socket adapter can be used without complicated process 4SCOPE of APPLICATION: Suitable for linking the drive end and output end of different shank diameters, applied to industrial engineering equipment, etc 5SMALL and COMPACT: The small and compact body does not take up too much use space, which is convenient for storage and use