Attach our Purfling/Soundhole Router Guide to your Rotary Tool to cut purfling channels and soundhole rosettes. We designed this machined aluminum attachment for cutting purfling channels along the edge of a profiled, unglued violin plate; an unglued fingerboard; or for rosette channels around a guitar soundhole (round or oval). It guides the cutter bit along tight curves and helps maintain constant routing distance from the edge. Simply unscrew the plastic collar from your Rotary Tool, screw the tool into the guide, and set the depth of cut with the tool's chuck. The cutting distance from the edge is adjustable. The guide is easy to handle and gives a good view of the work. Specs: Base of the tool is 2-3/8" x 1" (60.32mm x 25.40mm) Sliding platform is 4-1/8" x 1" (104.77mm x 25.40mm) Overall height is 2" (50.80mm), plus thumbscrew The cutting distance from the edge can be adjusted up to approximately 1" (25.40mm). Instructions included. Installation is easy: Simply unscrew the threaded plastic collar on the nose of the Rotary Tool or Router, and screw on the router guide. StewMac Purfling/Soundhole Router Guide fits these rotary tools with a 3/4-12 threaded plastic collar: 100, 4000, 400XPR, Professional, MultiPro™ and most corded models made since 1986 Black & Decker Wizard™ and RTX™