Made of Highly Durable Chrome vanadium steel and come in a convenient Storage Box/holder. | The ¼” Hex Shank will fit all quick change systems and standard drill chucks, which is ideal for both professionals and DIYers. | The chamfered edges and spring-loaded detent ball will ensure a tight and secure fit, thus allowing you to save your precious time and perform auto repair tasks easily. | The sizes included are 1/4-inch(65mm length), 3/8-inch(65mm length), and 1/2-inch(73mm length) | Backed by our Lifetime Limited Warranty for your complete peace of mind. If you have any issues with your PTSLKHN Impact Grade Socket Adapter/Extension Set, simply contact customer service for troubleshooting help, parts, replacement, or refund.