Fix high density reinforced linings securely. These 40mm corrosion-resistant steel screws are specially designed for fixing high density Rigidur H linings to metal or timber frames. They penetrate quickly and easily through Rigidur H's extra hard surface and reinforced core thanks to their self-tapping points and smaller than usual countersunk cross heads. This means they countersink more efficiently into the board's surface, saving you valuable time.