Fowler 52-720-000-0, Complete Scale Set of 30 Specimens

Includes Instructions Vinyl wallet Fowler's Surface Roughness Standards - ideal for checking, identifying and specifying by symbol the degree of roughness of machine parts - covers every machine method known and every obtainable value. Features Grade AA values are displayed in microinch and micron values. Quick, easy comparisons. Eliminates costly checking methods, saves time, reduces production of scrap caused by poor finishes. 30 specimens, each 7/8" x 3/8" in size, and made of electro-formed solid nickel. Each type of surface finish accurately and consistently reproduced to give operator a realistic idea of the feel, appearance and texture of the machined components.