Please don't buy this ground rod driver if you are using a SDS-Plus hammer. This ground rod driver is 18mm diameter standard SDS-Max . It is for SDS-Max hammers only. It does not fit into SDS-Plus hammers, Spline hammers and other system hammers. PLEASE CHECK YOUR TOOLS VERY CAREFULLY BEFORE PURCHASE. Industrial grade professional ground rod driver for 5/8inch and 3/4inchground rods. One-piece design with proprietary heat-treatment process, fully hardened high quality steel body and thick metal walls meet the demands of frequent use and deliver increased life and durability 10inch(250mm) long and 13/16inch(20mm) diameter socket opening, 2-1/8inch(54mm) deep inside the nest, accommodate ground rods up to 3/4inch (19mm) in diameter. A taper on the bottom of the driver throat makes contact with the top of the ground rod. It helps to minimize the mushrooming of the rod versus a flat-bottom driver Standard 18mm diameter SDS-Max is compatible with for , for , for , for and all SDS-Max system rotary hammers and demolition hammers Fantastic work saver. It saves you a lot of pounding with a manual hammer. Heavy duty, high efficiency, precise and effortless, perfect for commercial and industrial applications. Product is packed in a handy transparent plastic tube that is durable and convenient to store and carry There may be scratches on the metal surface, but it does not affect use. Colour:silver gray Material:Metal Size:250 x 20mm Package Contents: 1 x Ground Rod Driver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.