Features 40mm grenade replica is manufactured from 6061 T-6 aluminum to the same size as the real thing. Trailer hitch backing plate is manufactured from 6061 T-6 aluminum and has a diameter of 5 1/2". Hitch cover backing plate has multiple mounting locations so the projectile can match your manhood. Aluminum parts are hard anodized matte black and UV powder coated to provide color fastness. Steel U shaped mounting bracket fits 2" hitch receivers and is powder coated black.