This small adaptor can be placed into your regular hand drill, pendant drill, micro motor, electric engraving tool, or hobby drill to allow you to use the Diamond High Speed FG Dental Burrs range which have a 1.6mm (1/16") shank. The EVE, German made, collet reducer converts 2.35mm (3/32") to 1.6mm (1/16") (HP dental burs to FG dental burs). If using in a hobby drill make sure you have an adjustable chuck or a 2.3mm collet.