Diamond resin smoothing domes are perfect for smoothing glass on your grinder or lap! A resin or plastic bonded diamond dome has a shorter life span than the nickel bonded domes, but is a less aggressive option and some find it easier to work with edges. These are great for pre-polishing steps on inside curves. These domes are approximately 4" across the base and 2-1/2" in height. Standard thread sizes are 1"-14RH female and 5/8"-11RH female.