The Astro Tools RS516 50pc 5/16-18 Steel Rivet Studs are zinc-plated steel rivets with a #5/16-18 thread pitch. They have an outside diameter of 10.9mm and require an 11mm (7/16 ) drill hole. With a length of 16.5mm and an overall length of 30.5mm, these rivets are designed for heavy-duty fastening applications. Zinc plated steel rivet stud. Leaves a male stud when set to be able to hang and mount parts onto, install with rivet stud tool like Astro model #1455 Thread Pitch: #5/16-18 Outside Diameter: 10.9mm Drill Hole Size: 11mm (7/16”) Length: 16.5mm 50 Piece Pack Color Silver Item Weight 1.73 pounds Part Number RS516 Manufacturer Astro Tools Power Source hand_powered Item model number RS516 Batteries Required No Package Dimensions 6.22 x 5.08 x 1.73 inches Included Components 5/16-18 Steel Rivet Studs Warranty Description Manufacturer Warranty Item Package Quantity 1