This set includes two wire wrapping step mandrels; one offers diameters of 6, 7, 8, 9, and 10 millimeters, another measures 1.5, 2.5 , 3.5, 4.5, and five millimeters. A great idea for bead and wire artists! Made of stainless steel with a non-slip PVC handle. Nicely rounded, and extremely smooth so wire will not be scratched and gives the user consistent size loops time after time. Please contact us with any questions. Please visit our store for other great jewelry tooling items such as; Hand Stamps, Disc Cutters, Polishing Compound, Buffers, Hammers, Tweezers, Mandrels, Anvils, Vises and more! Thanks for Looking!