1、Standard Size: These reducing washers have 16mm flange and 14mm outer diameter protruding part, with standard production. 2、High Concentricity: When inserted into a 14mm hole, the small hole center remains concentric with the center of the 14mm hole. 3、For Robot Equipment: Suitable for smart robots and other mechanical equipment, reducing the aperture to fit more connection methods. 4、Aluminum Alloy: Made of excellent aluminum alloy material, lightweight and wear resistance, with strong practicability. 5、20Pcs in 1 Set: The kit includes 20pcs reducing washers, which are sufficient in quantity and can be used and replaced at any time. 20 x Reducing Washers Item Type: Reducing WashersMaterial: Aluminum Alloy Model Inner Diameter Outer Diameter 4904-0004-0014 4mm / 0.16in 14mm / 0.55in 4904-1025-0014 6.35mm / 0.25in 14mm / 0.55in