The Bosch GOP40-30B StarlockPlus Oscillating Multi-Tool Kit provides a tool that delivers the new professional standard in oscillating tool performance, providing the next-generation Starlock 3-D tool-accessory interface, 4.0 amps of power and advanced electronics. The Starlock interface has more contact surface area from tool to accessory for best-in-class blade grip and torque transfer, delivering a better cutting, grinding, scraping or sanding experience. The 4.0-amp motor provides a top speed of up to 20,000 oscillations per minute, to finish off heavy-duty applications. A variable-speed dial allows the user to set the optimal speed for the task at hand, and Constant Response circuitry maintains the desired speed under load. The GOP40-30 is compatible with all of Boschs full line of Starlock and StarlockPlus accessories for flush-cutting, plunge-cutting, sanding, grinding, grout removal, scraping and more. For compatibility with StarlockMax accessories, Bosch offers the GOP55-36 Oscillating Multi-Tool.