Converts rotary tool to plunge spiral saw and plunge router. For cutting precise patterns in thin sheet wood, soft metals, alloys and other low density materials. For routing of profiles in wood and plastics. Compatible with most rotary tools including Silverline, GMC and Dremel. Mandrel 3.17mm. Max 28,000rpm. Converts rotary tool to plunge spiral saw and plunge router. For cutting precise patterns in thin sheet wood, soft metals, alloys and other low density materials. For routing of profiles in wood and plastics. Compatible with most rotary tools including Silverline, GMC and Dremel. Mandrel 3.17mm. Max 28,000rpm.