16H105 up for sale is a lot of 2 grade 8 hex bolts , high grade steel plated silver cadnium the under the head length is 4 1/4 the overall lentgh is 4 1/2 long, these are used on the hmmwv and covered under gm part number 9415560 , these have a 1/2-13 thread that is 1 1/4 long, these bolts are part. of Modification work order MWO9-2320-280-20-7 rear cross member reinforcement kit .