Roll Bar Collars from CMS Performance Keep your shoulder belts or head containment net straps in place with these heavy duty but lightweight aluminum two-piece harness guide clamp that fits 1.50" and 1.75" roll bars perfectly. ROLL BAR HARNESS COLLAR DETAILS: Manufacturer: CMS Performance Manufacturer part number 1.50" ID: RB-COLLAR-AL150-BLK Manufacturer part number: 1.75" ID: RB-COLLAR-AL175-BLK Material: aluminum Finish: satin black anodizing Helps keep your harness shoulder belts or cage net mount in place Two-piece design makes installation easy Smooth radius on all edges so no scrapes or cuts when working in the area Priced per collar Perfectly sized to fit all roll bars with either 1.75" or 1.50" O.D. harness cross-bars. Precision-machined roll bar harness collars help keep your harness shoulder straps in exactly the right place on your roll bar. Easy to install double-split collars with high-strength Allen bolt hardware, they are available in satin black powder-coated aluminum.