Channel Practice Ring, Brass, 20 Holes for 3 mm round Stones

Practice channel setting 3 mm square stones or round stones. 22.6 mm OD and 4.8 mm surface width.

1.5 mm / 2 row holes. Flat surface and chamfered edge with 20.8 mm OD and 7 mm surface width.

Measures 24 mm OD and 6.8 mm surface width. Try out new methods for jewellery work with these practice pieces.

Flat surface and chamfered edge with 22.2 mm OD and 16 mm ID. Try out new methods for jewellery work with these practice pieces.