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Was used with an Ovalmatic Bowling ball jig for drilling. Can be modified with a spacer plate for a 3 point Ball jig to mount on it or other jigs/tools. Heavy Duty. 100 for all items. 2.) OvalMatic Ball Jig Base. Needs a bowl and span/lateral pitch levers for the ball to sit in. 3.) Base plate for mounting on a milling machine or on a drill press.