Hardened nail with a loose washer specifically designed for fixing thin sheet materials like plastic trunking and cable trays to masonry and concrete blocks. Washer head for increased clamping 35 sharp point for easy penetration Hardened carbon steel for extra strength Bright zinc plated for internal use" Shank Dia. mm: 3.70 Length mm: 35 Finish: Zinc Material: Hardened Carbon Steel Approx. Pcs Per 1kg: N/A Timco Masonry Nails - Washered - Zinc (Size 35 x 3.70 - 100 Pieces) in Silver