Straight hole jewel bearing ВКЦ are manufactured of different materials ВКЦ (Straight hole jewel bearing). Fabric GOST 22028-76 (leucosapphire), VAK (The plug agate cylindrical) Aagat AT-1 by GOST 15519-70, PSK (The plug sytallum cylindrical) TTs-27 Polycrystalline glass is the main materials which are applied in a production of exact technical stones. Except these materials in production apply ceramic, technical glass, etc. Plugs have to be manufactured with the requirement of State standard specifications or Tu. The plug shouldn’t have cracks in a working part scratch, a time or chips isn’t allowed. Plugs are intended for application as support in measuring and weight measuring devices, in water and electric counters.