Features: Brand new and high quality Compacts and versatile unit is easy install and maintain. Suitable for most SDS+ sized impact rotate hammers. Save-time and effort. Industrial grade for professional use. Made from hardened steel provides long lasting construction. Designed to drive grounding rods or without the need of large sledge hammers. Specifications: Material:Chromium Steel Size:M13/M14/M15 M13: Inner Diameter: 13mm Total Length: 145mm Sleeve Depth: 71mm M14: Inner Diameter: 14mm Total Length: 165mm Sleeve Depth: 75mm M15: Inner Diameter: 15mm Total Length: 166mm Sleeve Depth: 82mm Package Includes: 1x Ground Rod Driver Bit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.