This is a very nice, clean, radius gauge set. It is marked "THE L.S. STARRETT CO. ATHOL MASS. U.S.A. NO. 178 B" on one side. As you can see in the pictures the radius gauges are in two different sections, each radius gauge is removeable if you wish, and each is also marked with it's appropriate size. The radius gauges can also be used while still being attached to the main steel holder, and can be snugged up in any position inside the holder via the pivot screws supplied. The gauges, and the holder are in top condition, very little wear, no missing gauges, no rust, and no past owner's marks. This gauge is .8 x 3.4" long. The range of radius gages is 17/64" to 1/2". A super clean machinist tool!