Check the listing for details. 20Pcs M16 Split Lock Washer Spring Lock Washer 16mm ID 24.9mm OD 4.3mm Thick. Condition: New. Listed at 16.10 USD. Description:Material - These lock washers are made of 304 stainless steel material, which is durable, corrosion-resistant, wear-resistant, and has high hardness. They have good anti-rust and anti-oxidation properties to ensure long-term indoor and outdoor applications. Design - The open design of the spring lock washer creates a helical shape that applies a spring-like compression force to the nut and bolt when tightened, reducing friction between fasteners, and preventing loosening due to vibrations. Easy to Use - The split lock washers are effortless to install under the head of a bolt or nut and the surface being fastened, the split ends are bent during tightening to provide a locking feature by creating tension, reducing the possibility of fasteners vibrating or loosening.