The Stanley Aluminum Back Up Plates-30 Pack ensures quick and tight fastening that lasts for long. Made of aluminum, each back-up plate enhances the strength of the rivet hole. When used with aluminum, the plates offer maximum performance and durability. This Stanley Aluminum Back Up Plates-30 Pack comes in a plastic pack.Features Plastic packaging Made of sturdy aluminum Specifications Material:Aluminum Number of Pieces:30 Type: Rivet Back Up Plate Rivet Diameter: 3/16" Quantity: 1 Application: Hand Tool Diameter: 3/16"