This is definitely a rare and unique find. This is a “Diamond Back Harry Leary Turbo” Team Chain Ring and Tool Bag. For different tracks and multiple race strategies the racers had different sizes in Chain rings for different gear ratios. If you raced a Turbo, and were serious about it, this was a part of your gear. This bag has 2 pockets for Chain Rings and 3 pockets for the tools needed to change them out. They also kept extra Chain Ring bolts in them to stay ahead of the game and prepared for anything that may happen on the track. If you have a Turbo, or just really like them, this is a definite “must have” for your Bike Cave display. Any questions hit me up. Thanks for stopping by. Stay rad. Billy Grand.