LINKŪ extensions and sockets will not pull apart until you unlock them. When you want to separate them, a small pull on the locking device lets the socket or extension fall free. The locking device is similar to those found on air hose couplings, but is a lot easier to lock and unlock.

The revolutionary 3/8" Drive LINKŪ System tools are forged from solid steel, with a distinctive chrome finish for outstanding durability and strength.

The set includes: [1] Universal Joint, [1] Unique UniDriver TM Drive, [1] LINK Automatic-Locking Ratchet, [2] Extendors TM (2 and 6-inch), [2] Spark Plug Sockets (5/8 and 13/16-inch), [9] SAE 6-Point Sockets (5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, and 13/16-inch), [11] Metric 6 Point Sockets (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18-mm), [5] Socket Mounted Hex Bits (3/16, 5/16, and 3/8-inch, and 6 and 10-mm), [5] Socket Mounted Torx or Star Bits (T-25, T-30, T40, T45, and T-50), [4] Socket Mounted Screwdriver Bits (5-mm slotted, 9/32-inch slotted, #1 Phillips and #2 Phillips), and a Case.