Features:* & * 4pcs 1/4 3/8 1/2 Impact Cap Adapter Converter Air Reducer Impact Socket Wrench Adapter Hand Tool Kit Repair Tools * This kit allows you to mix and match drive sizes for sockets, ratchet handles, extension cords and other accessories.* Ideal tool for mechanics, engineers, carpenters or DIY enthusiasts * Spring Ball Bearing Retainer Specifications: Height: About 25mm, 26mm, 35mm, 36mm Hardness: 60HRC Made of Chrome Vanadium Stainless Steel Color: Black1/2" to 3/8" - (12.5mm Square Bore to 9.5mm Square Head) Length: 36mm3/8" to 1/4" - (9.5mm Square Bore to 6.3mm Square Head) Length: 26mm3/8" to 1/2" - (9.5mm Square Bore to 12.5mm Square Head) Length: 35mm1/4" to 3/8" - (6.3mm Square Bore to 9.5mm Square Head) Length: 25mm Package Content:4 * Socket Adapter