To be used before setting precious stones. Easy handling. The rings are firmly held between two cones and the exact rotation is regulated with a toothed wheel. For his work, the jeweller has an assortment of 14 toothed wheels from 15 to 28 divisions. It is possible to mark wedding rings at an angle of 22.5°. Supplied with 3 drills Ø 0.80 - 1.00 - 1.20 mm. Shaft Ø 1.50 mm.