DIY CNC Pressure Foot Clamping Hold Down System for CNC Router Model: spindle diameter 100mm/105mm/92.5mm/80mm/72mm/65mm etc DIY CNC Holde Down Features: Material: Stainless steel Diameter: 100mm (80mm/65mm, optional) Outline square: 132*120mm Height: 102mm Bottom inner circle diameter: 49mm Flexible distance: 28mm 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.