Racing Performer brass countersunk head screws
From the Racing Performer brand comes these high-precision brass countersunk head screws. Brass screws can be used in the chassis of the car to increase weight at the lowest point to improve the cars centre of gravity and in areas where additional weight is desired. Sold in packs of 10 they come in M3x6mm, M3x8mm & M3x10mm variants.
Source: Yokomo [teamyokomo.com]