This is the RPM Blue Pinion Gear Carrying Case. These will hold up to 15 pinion gears
RPM designed this enclosed pinion case to hold each pinion on its own post. There is no need to tighten the setscrew to hold the pinions in place. Included is a peel-off decal sheet with two pinion-to-spur gear ratio charts for both 48 and 64 pitch gears. The appropriate chart can be placed in the recessed area on the bottom of the case. Also on the decal sheet is a set of numbered squares from 14 to 31 (gear teeth), which can be adhered to the inside of the case. There are ten blank squares so you can write in your own numbers if needed. RPM Pinion Cases are available in translucent blue or black and holds as many as 15 pinion gears.