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!
