Keyfit Tools Pro Rail Aircraft Grade Aluminum Socket Holder Organizer 6 Piece Set Includes 1/4" 3/8" 1/2" Drive Rails & Socket Extension Adapter Swivel Universal U Joint Rails Color Optional For Standard Or Metric (Blue) Hard Coat Anodized For Superior Chemical Resistance 6 Piece Set Includes: 1/4" 3/8" 1/2" Drive 17" Socket Rails With 16 Spring Loaded Ball Clips On Each Rail 1/4" 3/8" 1/2" Drive 6" Extension Adapter Swivel Rails With 5 Spring Loaded Ball Clips On Each Rail ~Can Also be use to organize Torx, Hex, Allen Sockets 5) Extra 1/4" Drive Ball ClipsHard Coat Anodized For Superior Chemical Resistance 5) Extra 3/8" Drive Ball Clips 5) Extra 1/4" Drive Ball Clips Professional Air Craft Grade Aluminum Holds Clips So Sockets Won't Fall Off When Held Vertically Keyfit Tools Pro Rail Aircraft Grade Aluminum Socket Holder Organizer 6 Piece Set Includes 1/4" 3/8" 1/2" Drive Rails & Socket Extension Adapter Swivel Universal U Joint Rails Color Optional For Standard Or Metric (Blue) ~Hard Coat Anodized For Superior Chemical Resistance ~6 Piece Set Includes ~1/4" 3/8" 1/2" Drive 17" Socket Rails With 16 Spring Loaded Ball Clips On Each Rail ~1/4" 3/8" 1/2" Drive 6" Extension Adapter Swivel Rails With 5 Spring Loaded Ball Clips On Each Rail ~Can Also be use to organize Torx, Hex, Allen Sockets 5) Extra 1/4" Drive Ball Clips 5) Extra 3/8" Drive Ball Clips, 5) Extra 1/4" Drive Ball Clips ~Hard Coat Anodized For Superior Chemical Resistance Professional Air Craft Grade Aluminum Holds Clips So Sockets Won't Fall Of When Held Vertically Use The Clips On The Back Side Of The Rail For More Versatility