AtomStack R8 Pro Rotary Roller SetR8 Rotatry Chuck R6 Rotary Roller R8 features adjustable jaws or clamps, allowing it to securely hold objects of different thicknesses and shapes. R6 features adjustable parallel rollers to securely hold and rotate cylindrical items, such as bottles and tumblers, ensuring smooth, precise engraving on curved surfaces. Applications Irregularly Shaped Objects: R8 can securely hold various irregularly shaped items, including cups, spheres, and rings.