Abstract: A Concrete Polishing Extension device for treating hardened concrete surfaces and more specifically interior surfaces of countertop sinks made from decorative concrete. The extension device has features for use with grinding deep, contoured surfaces of concrete. The preferred embodiment is comprised of an extended shaft with connection features and other features; a containment cap; a means to connect cap to shaft; an external sleeve that encircles the shaft; a slip ring collar; a means to connect external sleeve to slip ring collar; a bearing such as a thrust bearing; means to connect slip ring collar to bearing; and a means of the extended shaft used to contain bearing, slip ring collar and sleeve assembly. The device has a distal end with means to removably attach to a standard driver and a proximal end with means to removably attach to engage a standard grinding head.

Abstract: A Concrete Polishing Extension device for treating hardened concrete surfaces and more specifically interior surfaces of countertop sinks made from decorative concrete. The extension device has features for use with grinding deep, contoured surfaces of concrete. The preferred embodiment is comprised of an extended shaft with connection features and other features; a containment cap; a means to connect cap to shaft; an external sleeve that encircles the shaft; a slip ring collar; a means to connect external sleeve to slip ring collar; a bearing such as a thrust bearing; means to connect slip ring collar to bearing; and a means of the extended shaft used to contain bearing, slip ring collar and sleeve assembly. The device has a distal end with means to removably attach to a standard driver and a proximal end with means to removably attach to engage a standard grinding head.