Neiko 00249A Wobble Extension Bar Set, 9 Piece Combination | 1/4-Inch, 3/8-Inch, 1/2-Inch Drive | Cr-V Steel Handy unique convex anvil shape wobble feature has a 16 degree angle that allows you to get a firm grip on odd angled sockets that are in low clearance spots Wobble bar extension set is constructed of strong chrome vanadium steel for extra strength and durability Eye pleasing fully polished chrome finish that is easy to clean and also resistant to corrosion Knurled handle allows for easy finger turning making it comfortable yet convenient for greasy fingers The nine piece wobble extension bar set includes: three 1/4-inch drive (2, 4, 9 inches); three 3/8-inch (3, 6, 9 inches); three 1/2-inch (2, 5, 10 inches) that can either be fully inserted for straight extension or partially inserted for the wobble feature