Steel is strong and cheap for everyday use. Aluminium is light and comes in colours for low-stress areas. Titanium is light and very strong, ideal for racing.

RC screws are sized like M3x10 (thread by length). Check your car’s manual, which lists the size for each location.

Common heads are cap (button), countersunk (flat) and flanged. Use the head your car’s part is designed for so it sits correctly.