Revolutionary injection molded bats cant warp; pin holes can't enlarge; will never wear out. Pin holes don't come through to the throwing surface so pot bottoms won't be marked "Easy lift rim" makes it easy to get your fingers under the edge for easy removal. Adapts to both 9" and 10" center-to-center pin systems, and a unique design allows a perfect fit without jamming for all wheels which use these systems with 3/8" diameter pins. No expensive adapter plate required! Not a good fit with Shimpo pins.