Specification Brand : M & J Tooling LLC ItemName : New M4 X .5 6g Solid Thread Ring GAGES 4 0.5 GO NO GO P.D.'S = 3.655 & 3.580 - DW33329MJ ItemTypeKeyword : thread-gauges Manufacturer : M & J Tooling LLC NumberOfItems : 1 PartNumber : DW33329MJ ProductDescription : YOU ARE PURCHASING THE PICTURED RIGHT HANDSOLID THREAD RINGGAGES.