This corner jig kit features changeable inserts, allowing you to use the same handle with various corner pieces! Saving on storage and allowing for easy adjustments on the fly. This kit comes with thumbscrews, as we as flush Philips head screws to allow for use with larger tools and trim routers. We offer kits for both Imperial and Metric measurements for both rounded and chamfered edges! Each kit comes with ONE handle, Three thumb screws and Three phillips screws. The kits include the following measurements: Imperial Rounded Edges ( 5/16", 5/8", 0.25", 0.5", 0.75", 1", 1.25", 1.5", 1.75" ) Imperial Chamfered Edges ( 1/4", 1/2", 3/4", 1", 1-1/4", 1-1/2" ) Metric Rounded Edges ( 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm ) Metric Chamfered Edges ( 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm )