Vintage Carborundum Grease-mixed silicon carbide valve grinding paste. It''s contain Coarse and Fine Carbide Grinding Paste. Tin measures 4" x 2" x 1" (10 x 5 x 2.5cm). There is a small amount of compound remaining. Silicon carbide valve grinding compound by "CARBORUNDUM" While particularly adapted for automobile engine valves, can be.