Great Planes Washer Lock #4 GPM-Q3432
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.
Eight #4 Lock Washers and a reusable plastic parts pack
Inside Diameter:...120 (3mm)
Outside Diameter:...204 (5.1mm)