● It is a concrete surface for uniform installation so you can and aesthetic. ● dedicated hand holder can make sure your installation complete. ● The Call of the screw: M12 screw ● Total length (mm): 50 Length (mm): 20 ● tensile Max load (kN): 24.5 outer diameter (mm): 16.0 ● drilling diameter (mm): 16.5 Weight (g): 53.9 ● box 3-Pack, [Material]: Stainless Steel ● surface treatment: Trivalent chromate finish [Occasion]: ● 電設, construction, plumbing, construction, heating duct construction, and much more.