I got these to run in my Tamiya TRF415MSXX, but they can be used on other chassis and for other RC applications - not just Tamiya cars!
If you are serious about setting up your vehicle, it's very important to remove 'play' - the movement that you get sometimes in RC components. There doesn't seem much point spending time and money on setting up your RC vehicle, like a car if there is movement - especially in the area of the wheels. Shim packs like these, and the Tamiya 5mm Shim Set (part number 53587) are what anyone serious about RC buys to really get the best out of their vehicle.
You get 30 shims in total in this pack - which will last for ages! I bought the Tamiya 5mm, 4mm and 3mm shim packs, rebuilt two cars completely with new shims and still have loads left in my pit box! When performing maintenace on your car you should always check that the shims have not been damaged or bent. Take a close look at the surface when you clean them up. ALWAYS replaced damaged shims!!
A final tip when you are handling them - be very careful when you are fitting them not to bend them... they are VERY thin, precision made shims and although they are tough and strong it might be possible to bend one if you are not careful.