Shop All Parts › P283804 - Disc Blade, Flat, 18", material thickness 5mm. Rivet hole P283804 - Disc Blade, Flat, 18", material thickness 5mm. Rivet hole $43.50 Disc Blade, Flat, 18", material thickness 5mm.Rivet hole center circle Dia. 112mm, center hole size 77mm Disc Blade, Flat, 18", material thickness 5mm.Rivet hole center circle Dia. 112mm, center hole size 77mm Add To Cart Added!