Feature: 1. Application: Suitable for 95% engravers in the market. This machine can work directly with the engraver on materials with a cylindrical shape. According to the cable attachment, the machine can work with mainly engrave on material with a cylindrical shape. 2. The Rollers can be set at 4 different distances, 4-138mm adjustable range, easy to be adjusted without the use of wrench screwdriver. Support 195mm cylinder length objects. 3. Suitable for Engraving Cylindrical Objects - Place your cylindrical work stably on the rotary roller and connect it with the engraver. It's suitable for engraving cans, wine bottles, cups, curved crafts, and more. 4. The roller shaft is all metal structure, one piece rubber roller, the hardness reaches 60A, the friction force is stronger, and the engraving process is more stable. 5. Easy to operate: no need to install, connect the rotary roller with the engraver as soon as out of the box. Specification: Specification: Main Material: Metal, Rubber Package Size: 295x190x80mm / 11.6 x 7.4 x 3.1in Package Weight: 1016g / 2.2lb. Package List: 1 x Rotary Roller Kit