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The fastest Drill Sharpener easiest Drill Grinder quickest Point Splitter you can buy! The TDR/SRD family of drill grinders is exclusively designed and manufactured by Service Precision Grinding Inc. SPG started as a precision grinding shop offering service for ID, OD and spherical grinding. From that experience, with grinding, came an understanding of the destructive nature of grinding dust and the need to keep it away from any movable parts.