PRODUCT SPECIFICATIONSPart #: 0000-119886Fastener Type: Carriage BoltSize Description: 1/2"-13 x 1 1/4"Diameter/Nominal Size: 1/2"Length: 1 1/4"Head Diameter: 1.032-1.094"Head Height: 0.250-0.270"Neck Across Square/Diameter: 0.492-0.515"Neck Height: 0.250-0.281"Thread Pitch: 13Thread Pitch Type: CoarseThread Direction: RightSystem of Measurement: InchMaterial: Stainless Steel 18-8Finish: Plain Finish (No Plating)Average Piece Weight: 0.1018000 lbs.Carriage bolts are Ideal for use in square holes in wood-to-wood and wood-to-metal fastening; bolt has a square neck that prevents it from turning once screwed in. When trying to determine the length of the item, measure from just under the head of the bolt.