bur chuck for 5/16" arbor shaft

A JSP exclusive invention, this versatile bur chuck system allows you to mount nearly any mandrel-based tool directly onto a miniature polishing motor with a 5/16" shaft. The precision steel adapter sleeve secures to your motor shaft with two tightening screws, while the business end features a Keyless Jacobs-Style Chuck that safely and firmly grips mounted tools with mandrels from 1 mm to 4 mm. Strong, stable, and incredibly convenient, it expands the capabilities of any polishing setup without the need for a flexible-shaft machine.