3/8" Square x 1/4" Hex Shockwave Impact Adapter Milwaukee shockwave impact duty socket adapters are engineered for extreme durability and up to 10x life. Made from proprietary steel and heat treated to control hardness, the shockwave impact duty socket adapters provide fastening capabilities with all impacts. Broadly targeting cordless users, the shockwave impact duty accessory line is not only ideal for heavy duty impact applications, but delivers a full system solution for all the user"s drilling and fastening needs. Features: 3/8" Square x 1/4" Hex ShockwaveTM Impact Adapter Since its founding in 1924, Milwaukee has focused on a single vision: To produce the best heavy-duty electric power tools and accessories available to the professional user. Today, the Milwaukee name stands for the highest quality, durable and reliable professional tools money can buy.