Specifications: Diameter [mm]: 4 Working length [m]: 45 Total length [mm]: 80 Unit of measurement: pcs. Chuck: cylindrical For hammer drilling in very hard materials such as granite Exceptional hard and wear-resistant carbide tip for up to 40% more holes This product is appreciated by stonemasons for its ability to drill in natural stone such as granite Specially shaped cutting edges are more durable ** Illustrative photo.