R-OTR-63/70 Zinc flake self-drilling screws to composite panels to concrete and timber

Hardened screw's thread surface. High quality anti-corrosion coating guarantees resistance of 15 Kesternich cycles.  
Shape of the tip facilitating correct turning and allowing penetration in wood and concrete.  
The shape and type of screw's thread is designed specifically for connecting to concrete and wood. The drill point is designed to provide a fast and hassle-free installation. Sharp point of the drill prevents movement of the surface of the fixture.  
Special zinc flake coating for increased corrosion resistance  
Self vulcanizing EPDM washer. Temperature and UV resistant. The special shape of the washer ensures proper seating of the sealing material on the outer cladding material fixture which guarantees a proper seal.  
Two type of thread : first for fixing in the ground, second with a larger pitch under the head protects against indentation of the outer cladding of the board and helps in sealing the connection