DIY CNC Pressure Foot Clamping Hold Down System for CNC Router Model: spindle diameter 100mm/105mm/92.5mm/80mm/72mm/65mm etc Spindle Pressure Foot Applications: Suitable for any kinds of Acrylic, thin aluminum board, PCB prototyping, printed circuit board routing, plastic board, PVC board, EVA board, double color board, MDF board, etc, especially for panels within 10mm thickness. Different spindle, the spindle diameter is different. So different size cnc router spindle automatic pressure foot is needed. Please contact us to get more information.