1.Made of fine stainless steel material, it is not easy to rust. The serrated design makes the gasket tighter and not easy to slide. 2.The set includes 8 types of washers of different sizes to meet your different needs. 3.They are integrated in a box, portable and comfortable to access and store.Precise design, wear resistance, high reliability. 4.The bearing clip, which is the bearing retaining ring, is a type of hole movement in the groove axis to fix the components. The inside diameter of the retaining ring is slightly smaller than the inside diameter of the mounting shaft. 5.Clip-on pliers must be used for installation. Insert the jaws into the holes in the retaining ring clip and expand the retaining ring to insert it into the pre-machined shaft groove. Item Type: Serrated Locking Washer Material:stainless steel colour:Silver Package Contents: 50 * External Serrated Lock Washer M2.5 50 * External Serrated Lock Washer M3 50 * External Serrated Lock Washer 40 * External Serrated Lock Washer M5 40 * External Serrated Lock Washer M6 30 * External Serrated Lock Washer M8 20 * External Serrated Lock Washer M10 20 * External Serrated Lock Washer M12 Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.