This Blue Spot set contains 4 adaptors and 3 universal joints, each made from chrome vanadium for durability. They are supplied in a handy plastic storage case. The set contains the following: Adaptors:1/4in Female gt; 3/8in Male.1/2in Female gt; 3/8in Male.3/8in Female gt; 1/4in Male.1/2in Male gt; 3/8in Female. Universal Joints:1/4in, 3/8in and 1/2in.