Bosch DH1020VCRT 15 Amp SDS-max Inline Demolition 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. In-line design offers better weight distribution in both vertical and horizontal applications Constant Response circuitry soft-start provides overload protection and maintains constant speeds Vario-Lock rotating chisel locks into 12 different positions to optimize work angles Variable-speed control dial for optimal speed selection in various jobs and applications