This is a replacement XRAY Belt Tensioner Set, and is intended for use with the XRAY T2 007, T2 008, T2 009, and T2R Pro. This smart, easy-to-use XRAY Belt Tensioner Set is used to control the center drive belt tension and prevent twisting. High-quality components include CNC-machined lightweight aluminum mounting post, high-speed ball-bearings, and mounting hardware