1、CORROSION RESISTANT MATERIAL: 304 stainless steel spring lock washer group, possess good corrosion resistance, can be used in wet environment 2、7 MOST COMMONLY USED SIZES: Flat mouth and lock washers include M2.5, M3, M4, M5, M6, M8, M10 specifications 3、EASY STORAGE: Get your gasket ready for your next home or car project. The set contains 260 pieces and is packaged in a convenient, sturdy plastic box with multiple compartments and an inner lid display for easy organizing 4、OPTIMAL SURFACE AREA: Each stainless steel flat or lock washer easily deflectors screw or bolt loads, evenly distributing weight for a safe and reliable fit, ideal for use in the home or workshop 5、SAFE AND DURABLE: These lock washers and flat washers provide excellent protection and security for nuts and bolts, and can be used for a long time with excellent durability