Quick-release clamps are designed to fit into the T-slot on the bottom of the track saw guide for secure positioning And can be used with dog holes or channels on an table to secure workpieces for cutting, grinding and milling. Ratchet mechanism: Ratchet mechanism can be easily locked and quickly released It really speeds up changeovers compared to tightening and loosening screw-type clamps These ratchet clamps are effortless and you can work faster and longer with them., Manufacturer: Akfldms