Specification Brand : M & J Tooling LLC ItemName : New 5/16 20 UN 2A Solid Thread Ring GAGES .3125 GO NO GO P.D.'S = .2788 & .2748 - DW33426MJ ItemTypeKeyword : thread-gauges Manufacturer : M & J Tooling LLC NumberOfItems : 1 PartNumber : DW33426MJ ProductDescription : YOU ARE PURCHASING THE PICTURED RIGHT HANDSOLID THREAD RINGGAGES.