The Mastercarver® Micro-Pro Champion handpiece will fit on most brands of micro motor control boxes. This is the original equipment manufactered handpiece supplied with Micro-Pro by Mastercarver® sold after 09/15/11. If you already have a control unit from a lessor machine this is a great way to upgrade to MASTERCARVER® MICRO-PRO quality and 46,000 RPM plus save a few bucks. Includes 46,000 rpm handpieces plus 1/8″ collet and spare motor brush set. Weight: 7.3 oz. Quality backed by 1-year warranty.