Roller: Our 20-tooth rollers are made of high-strength alloy, offering exceptional durability and strength, making them ideal for chiseling. Convenience: The square handle hammer drill is ergonomically designed for easy installation. Its loadable and detachable features enhance cost-effectiveness and application flexibility. Hammer Drill Bits:The reinforced square handle connecting rod is durable, and combined with a thickened base and double-layer three-head alloy rollers (3x20 teeth), it is ideal for chiseling through materials such as cement, concrete, and stone. Grinding Wheel: Upgraded three-head alloy grinding wheels, specifically designed for square handles, feature a double-layer structure for improved chiseling efficiency and superior results, while ensuring the longevity of the square handle hammer drill (rotation only, no impact). Service: If you have any questions, please feel to contact us and we will reply within 24 hours!, Manufacturer: ZHJOPP