Features: Engineered with 304 stainless steel and shaking resistant disk spring design, these single sided serrated lock washers deliver superior anti loosening performances for automotive, machinery, and industrial applications. The erosion resistant stainless steel construction combines a domed profile with accuracy stamped teeth to create double action locking force while resisting rust in harsh environments. Ideal for mechanics, construction professional, and enthusiasts requiring secure fastening solution for high shaking equipment, outdoor structures, or frequent assembly furniture projects. Perfectly suited for engine components, marine hardware installations, outdoor furniture assembly, and industrial machinery maintenance where shaking resistance and durability are critical. These versatile locking washers offer general compatibility with standard bolts/nut while meeting standards through reusable stainless steel construction a sustainable upgrade from replaceable fasteners. Specifications: Component : 304 stainless steel Storage box size: about 13.2x6.8x3.2cm/5.2x3x1.3inch Package Includes: 160pcs Spring Lock Washer Or 260pcs Spring Lock Washer note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.