An assortment of zinc-plated metric split lock washers from The Hillman Group. 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. Variants included in this assortment feature a zinc finish and range from 4mm to 20mm in diameter. Full assortments of #3697 contain nine (9) refills comprised of Hillman item numbers #1433 - #1437, #2469, #2523, #3698, and #3699.