Great Planes' Lock Washers are incredibly effective protection against vibration-loosened hardware and related damage. The washers feature a split design digs into wood and holds metal fasteners tight to prevent screws from backing out due to vibration. The washers have a special Zinc plating that resists corrosion and rust. The washer come with Great Planes' 1 year satisfaction guarantee.
Includes: Eight #4 Lock Washers and a reusable plastic parts pack