With more contact surface area between the tool and accessory, the Starlock interface is a cupped 3-D tool-accessory connection that delivers greater torque transfer for an expanded work capacity. The no-touch blade-change system makes it easy to attach, remove or reposition blades. The professional-grade 4-amp motor delivers a top speed of up to 20000 oscillations per minute and the tool provides a 3.0 deg. oscillating arc. 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. This robustly constructed tool has reinforced gearing for more durability, less vibration and optimal force transmission. At only 3.3 lbs., this light and compact tool reaches tight spaces, provides comfortable ergonomic grip zones and has an LED light for illumination in dark work areas. It is ideal for flush cuts such as door-jamb cuts (using various plunge or segment blades). The GOP40-30 provides outstanding versatility - utilizing the many Starlock and StarlockPlus accessories to handle flush-cutting, plunge-cutting, sanding, grinding and many other tasks related to a wide array of materials.