This professional jeweller's tool will enable you to create consistently sized loops, circles and coils in wire. It is made from carbon steel with a the smooth surface which will not mar wire and has rubber grips.
Each tool has 5 diameters. Measurements of the small mandrel are 1.5, 2, 3, 4 and 5mm. Measurements of the large mandrel are 6, 7, 8, 9 and 10mm.