The Tool Adapter reduces the clamping diameter from Ø 43 mm to Ø 20 mm to comfortably mount the Plotting Pen and a Proxxon in the Tool Holder. Additionally to the Ø 43 mm / 20 mm adapter, the Ø 20 mm / 8 mm Tool Adapter is required to mount the 3D Touch Probe, the Mini Engraving Point and the Mini Drag Knife onto the CNC system.