Body clips or pins are used on almost all RC cars to hold the body in place, but the same type of clips are also used on many cars to hold down other parts, such as battery straps etc. They make for a lightweight, easy to use solution without any need for special tools. Body pins tend to get lost now and then though. Luckily they are not expensive, and there’s a huge variety available for different uses.
At EuroRC you will find body clips in all sizes and colours, as well as special body pin holders and retainers.