Heavy Duty Double D Rings Kit includes 10 D-ring double & 20 small screws. Heavy Duty Double D Rings for Picture Framing mounts and canvas Hanging. Nickel Plated. Heavy Duty made with thick steel can hold up to can hold up to 80 LB OR 40 KG mirror or picture. Each D-ring comes with 2 small screws (To screw into the frame). Small screw size is 15MM. (Which you screw into the frame.)