Features CORROSION-RESISTANT MATERIAL: 304 stainless steel spring lock washer group, possesses good corrosion resistance, can be used in humid environment. EASY STORAGE - Prepare your joint for your next home or car project. The set contains 260 pieces and is packed in a practical and sturdy plastic box with multiple compartments and an inner lid for easy organization. OPTIMAL SURFACE: Each stainless steel flat or locking washer easily deflects screw or bolt loads, evenly distributing weight for a secure and reliable fit, ideal for use at home or in the workshop. Safe and Durable These lock washers and flat washers provide excellent protection and safety for nuts and bolts, and can be used for a long time with excellent durability. 7 Most Commonly Used Sizes The flat washers and lock washers include M2.5, M3, M4, M5, M6, M8, M10 specifications. Specification: Item Type: Flat Lock Washer Assortment Kit Material: 304 stainless steel. Flat washer: M2.5, M3, M4, M5, M6, M8 (20pcs each), M10 (10pcs) Lock washer: M2.5, M3, M4, M5, M6, M8 (20pcs each), M10 (10pcs) Package list: 130 x flat washers. 130 x locking washers. 1 x storage box. Note: Due to its small size, please keep it properly to avoid accidental swallowing or other danger caused by children playing! Package List 130 x Flat Washer 130 x Lock Washer 1 x Storage Box