Marble V-shaped frame is a measuring tool for detecting cylindrical marble, manufactured according to GB4972-85 standard, usually supplied in pairs. It is a quadrilateral with four working faces or four 90 degree grooves of different sizes. Marble V-shaped frame is mainly suitable for inspection and marking of shaft parts, shaft inspection, calibration, marking, and can also be used to inspect the verticality and parallelism of workpieces.

V-shaped iron and V-shaped frame are manufactured according to GB4972-85 standard and are generally supplied in pairs. They are a quadrilateral with four working faces or four 90 degree grooves of different sizes. Mainly suitable for inspection and marking of shaft parts, shaft inspection, calibration, marking, and can also be used to inspect the verticality and parallelism of workpieces.

V-shaped iron and V-shaped frame are used in conjunction with flat plates to inspect the concentricity of various types of shafts, and are used for marking and assembling high pad iron. V-shaped iron and V-shaped frame types are divided into one slot and four slots, with pressure plate type and basket type with horseshoe shaped clamping frame. Inspection and measurement standards; Checking the dimensional accuracy or shape deviation of parts and making tight lines is also an essential tool in mechanical manufacturing.