Bosch 11264EVSRT 1-5/8 in. SDS-max Rotary Hammer (Certified Refurbished) This Certified Refurbished product has been tested and certified to work and look like new, with minimal to no signs of wear, by a specialized third-party seller approved by Amazon. The product is backed by a minimum 90-day warranty, and may arrive in a generic brown or white box. Accessories may be generic and not directly from the manufacturer. Constant response circuitry maintains speed under load and overload protection Turbo power delivers 20% more power in hammer only mode Vario-Lock positioning rotates and locks chisel into 12 different positions Auto-Max variable-speed dial ensures maximum speed every time the tool is turned on