I purchased this ball to use for lighter or broken down patterns but never could get it to work, seemed like a lot of over and under. Tried using it on medium with no success. Finally I decided to change the cover surface took it down to 360 then light with 500 then 2000 with factory polish and it is now my bench mark ball, I just love it. Its drilled with the number 1 hammer drill pattern
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Carl
Bless the LORD o my soul and all that is within me bless his holy name