5/16"-18 X 4 1/2" Carriage Bolt 18-8 Stainless Steel Fully Threaded --- Material: 18-8 Stainless Finish: Plain Full Size: 5/16"-18x 4 1/2" Diameter: 5/16" Length: 4 1/2" Threads Per Inch: 18 U.O.M.: Imperial Thread Length: Full Thread Thread Type: UNC