The WA is a GR Pottery Forms Bat system to turn a slab into a plate. The WA helps to cut an even lip and cut a foot ring to thrown a foot in one seating. The standard round GR Pottery Forms now come with a drill hole to fit onto this Bat system. The center hole allows the maker to push the spacer up from the bottom to lift form slab from the WA surface helping to eliminate finger marks.

15" outer diameter with 10" diameter to center of drill holes for batt pins. This fits all the standard US wheel heads. 

All forms are measured in inches.