Circle sizes: 7/16"- 9/16"-11/16"-7/8"-1 1/8"-1 3/8"-1 5/8"-1 7/8"-2 1/4"-2 3/4" -Designed for use with a drag shield attachment- diameter should be within .010" for proper cutting -Hypertherm - .380" dia. (some Hypertherm models are .430" dia.) -Miller - .430" dia. (some Hobart and Eastwood models are this size) -Thermal Dynamics - .580" dia. (will not work with cutmaster 42) -External circle size- -2" larger - Hypertherm - Example: The 7/8" stencil will cut a 2 7/8" outside dia. -2" larger - Miller - Example: The 7/8" stencil will cut a 2 7/8" outside dia. -2 1/4" larger - Thermal Dynamics - Example: The 7/8" stencil will cut a 3 1/8" outside dia. The circle size is cut from the center of the arc, which makes an interior cut slightly oversized and an exterior cut slightly undersized. We found this ideal to allow easy fitment on most parts.