Calibers of the clamp are not adjustable , means of measurement and control of conformity of real dimensions of the surface of the location and shape of products, established by the regulations. The use of calibers for shafts, outer planes and dimensions is economically justified in serial and mass production. Calibers are divided into limit and normal. Calibers not adjustable < / u> - means of measurement and control of the conformity of the actual dimensions of the surface of the location and shape of products, established by the regulations. Executive dimensions: GOST 21401-75 Design and dimensions: GOST 18355-73, GOST 18356-73, GOST 18358- 93, GOST 18360-93, GOST 18367-93. Tolerances: GOST 2015-84