This package has 40pcs M8 Spring Lock Washers (split lock washers), standard M8 size: inner diameter 8mm/0.31", outer diameter 12.5mm/0.5", thickness 2.0mm/0.08". As small split lock washers for M8 fasteners, they perfectly match M8 screws, nuts, bolts, meeting precise fastening needs in various projects. Crafted from high-grade 304 stainless steel, these split lock washer stainless steel offer top corrosion, rust, oxidation resistance, reliable in high temps, cold weather, high humidity, durable with smooth finish. With offset split ends, the spring lock washer bites into materials when tightened, boosting bolt tension; as heavy duty split lock washers, they prevent loosening from vibration/aging. Widely used in sheet metal, deck building, automotive repairs, etc., compatible with M8 fasteners and standard washers for load distribution. Note: They have inherent weak magnetism (from 304 stainless steel's manufacturing), a normal, non-defective trait.