The Ball Bearing Rub Collar is one part of a machine setup. Always use the proper guide devices (such as fences, guides, patterns etc.), holding devices (such as jigs, hold downs, power feeders, etc.), Warning Disc and a Dust Shield in conjunction with the Ball Bearing Rub Collar. ATTENTION: Prices are out of date, visit Weaver Company Online Store- Ball Bearing Rub Collars for updated prices.