One-piece solid casting: The raw material is formed by heating and pressure, with strong bearing capacity/no cracking/rust-proof Anti-rebound hexagon, inner lock design: Once locked, it will not rebound and loosen. Anti-slip gasket: Strengthen friction to prevent sagging, avoid direct contact between metal and glass, damage to glass, silicone and cotton blends Rubber washers can be securely and safely fixed to the glass., Manufacturer: YKMYXZ