5/16″-18 x 1″ Plain Grade 5 Steel Left Hand Thread Hex Cap Screws (3 pcs.)
Diameter: 5/16″ Length: 1″ Material: Steel Finish: Plain Head Style: Hex (1/2″ Wrench) Thread Size: 18 (Left Hand|Coarse) Thread Length: Full Hardness: Grade 5 Style: Left Hand Type: Cap Screw Box of 3. A hex cap screw has a hexagonal head, designed to be driven by a wrench.