|Works in any vise that holds 2/0 hooks. Tool body precision built of stainless steel with brass fittings. Includes 2 stainless steel pins (.041" and .062" dia.) AND two premium, machined, tapered, and hardened mandrels(.062" and .041") to fit all HMH tubes. An elegant and effective solution for holding tubes. Made of steel in the USA. Clamp the tool in any vise that accepts a 2/0 hook, and you can tie tube flies with ease. Illustrated Instructions included. Still a great package at a great price.