Characteristic: The grounding rod screwdriver is made of steel, which is durable, high in hardness, high in strength, wear-resistant and impact-resistant, provides good rust protection and can be used for a long time. There are two different types of drills, including a 21 mm drill driver and a 19 mm round drill screwdriver. Our grounding rod driver is compatible with almost all of SDS plus rotary hammers and hammer drills. Please make sure it fits your tool before buying. The drill screwdriver is easy to install and disassemble without the help of other tools, saving your time and improving work efficiency. The drill bit with metal wall can bear greater impact without damage. With this grounding rod driver, you don't need to use sledgehammers and wooden boards to install grounding rods, small fence posts and small electric fence posts. It can time and provide you with higher security. Describe Name: round drill driver Specification: 19mm,21mm Quantity: 2pcs Material: steel colour: silver Package Contents: 1 x 19mm round drill driver 1 x 21mm round drill 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.