With this Miter gage you get 27 Precision determined Stop Positions (every 5 degrees from 0 to 60 degrees in both directions plus additional at 22.5 degrees, useful for 8 sided Octagons). Unlike the stock miter gage that comes with most equipment, this gage is designed for precise repeatable angles after it is dialed into your machine. The miter bar is designed for a snug fit in Machines with a 3/4 by 3/8 inch miter slot. It will also work with a 3/43/8 inverted T slot. The Three inch by 24 inch precision fence With then Miter gage you get 27 Precision determined Stop Positions every 5 degrees from 0 to 60 degrees in both directions plus additional at 22.5 degrees, useful for 8 sided Octagons. The fence mounting slots in the protractor head are designed to work with our 24 inch precision aluminum fence with stop, our 18 inch Box Joint Fence, or most commercially available fences available from other manufactures. Made from heavy gage Aluminum and steel. Includes Instructions for the miter gage as well as the fence options The Fence and Stop are substantial and well made 24 inch nominal (23.6 actual) by 3 inch high for great work support. The curser on the Stop allows for precise repeatable measurements.