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Automatically centers itself on round, square or irregular shapes. Handles stock up to 2" thick. Drill-hole sizes are 1/4", 5/16", 3/8", 7/16" and 1/2". Six hardened steel bushings are provided: 2 each of 1/4", 5/16" and 3/8". You can drill two identical parallel holes without moving the jig. Easy to use! Item is brand new and will have preservative oil on it, this is normal. Product length: 4 3/4" Product height: 2 1/2" Product width: 4' (extended) NOTE: If the jig needs to be re-centered, please remove the two small allen screws holding the e-clip (picture 2) on the large middle main screw and the e-clip and untwist the main lever to re-center.