The Williams SD-Series is vintage-style, industrial-grade SAE deep sockets with a 1/2-inch drive and a 12-point configuration.

   These sockets features the highly desirable, clean "Long-Tail S" style stamp with the "USA" directly underneath it. It is a "Dual-Band" variant featuring 2 parallel alignment grooves cut into the steel directly below the info stamp, used historically by Williams to visually identify deep socket profiles.