Hillman Split Lock Washers 9/16 " Zinc Plated Steel 50 / Box Engineered to provide more uniform load distribution, split lock washers are great for any indoor/outdoor project. Ideal for situations where potential loosening from corrosion or vibration is a concern, split lock washers are used to prevent nuts and bolts from coming loose. These fasteners contain split ends that help "lock" into the mating material, thus providing a locking feature when tightened beneath a nut. The zinc finish provides moderate corrosion resistance. Use with treated lumber in applications with like nuts and bolts of similar diameter. *; ; Brand Name: Hillman Diameter: 9/16 in. Finish: Zinc-Plated Material: Steel Product Type: Split Lock Washer Number in Package: 50 pk Packaging Type: Boxed Unit of Measurement: Metric C-Pak Hardened Features Zinc plated steel Box of 50 Hardened C-Pak 9/16" USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.