Sets concrete or terrazzo floors to a smooth and consistent finish using water only, no dangerous chemical required. Have floors ready for polish in as quickly as 6 passes. This system uses fewer tools resulting in faster results. No need to replace multiple blades that can result in damaged hardware or improper installation. Reorder a new tool once the black nylon wear indicator is visible. Continue to use the current tool until the new one arrives. Rotation: Clockwise. Block type: Plastic.