for checking raised and recessed curves, standard steel, concave and convex shaped gauge sheets, finely cut radius shapes, number of sheets 17, pitch: from 1-3 mm, 0.25 mm each, then 0.5 mm, number of sheets 16, pitch: 0.5 mm each, number of sheets 15, Incline: from 15.5-20 mm each 0.5 mm then 1 mm