1/2" thick precision steel parallel set 4 pairs/set 0.0002" #703A-755

4 pairs 1/2" thickness precision steel parallel set. All 6" long. Made of high quality hardened steel. Precision ground. Within 0.0002" in parallelism. Paired 0.0002" in height Inluding 1 pair of the following heights: 1/2 x 1 x 6-----------5/16 hole 1/2 x 1-1/4 x 6------3/8 hole 1/2 x 1-1/2 x 6------7/16 hole 1/2 x 1-3/4 x 6 ------1/2 hole Fitted in deluxe plastic box.