While originally intended for use with their Standard, Spartan, and SX series fly tying vises, the adjustable HMH Bobbin Rest is compatible for use with any manufacturer's vise sporting a standard 3/8 inch vise stem. Machined from sturdy stainless steel, with a delrin cradle, delrin clevis, and knurled brass fittings too, the HMH Bobbin Rest measures approximately 9.00 inches long with a 4.00 inch upright leg height.