The Impact Socket Set by Pittsburg includes 4 pieces with sizes 19mm, 13/16″, 7/8″, and a 3″ adapter. This set features sockets in both SAE and metric measurements, suitable for various automotive applications. The drive size is 1/2 inch, providing a secure and reliable connection for impact wrenches. The set is designed for professional use and includes a socket adapter for added versatility in different job situations. R. 4823 8018