The Rotor Pack contains approximately 50 each of 20 common internal/external retaining ring sizes for a total of 1,000. Each group of 50 is taped stacked and includes the size of the ring on each.

The kit consists of internal retaining rings that will fit housings or bores from 3/8 in. in diameter to 1 1/8 in., and external rings that will accommodate shaft sizes from 1/4 in. in diameter to 1 1/8 in. Rotor Pack comes in a package that features four plastic boxes with easy open/close lids. One of the boxes features two pliers that will fit every ring in the kit. All four boxes fit into a holder that is designed to fold in half for easy handling and storage.