The spigot on this fast acting ratchet hold down fits perfectly into any 20 mm bench dog hole. It makes an ideal addition to the Festool MFT/3 Multifunction table other grid tables with 20 mm holes. The spigot mount, locking knob and square support plates are S303 stainless steel CNC machined, highly accurate and rust free. The ratchet mechanism can generate exceptionally high clamping force; the support plates spread the load, preventing the spigot from deforming the dog hole. Parf dog holes and those in the Festool MFT/3 rely on their exact sizing to maintain accuracy, whenever feasible; it is advisable to use the support plates. The top 4 mm of the spigot is 25 mm diameter, without a support plate this sits directly on top of you bench and precisely matches the 25 mm portion of original Parf dogs. It allows you to use the clamp’s spigot as a reference, positioning and clamping a workpiece at the same time. The maximum bench top thickness is 30 mm.