The senco ds5525 dura spin screwdriver has a high 2500rpm torque motor thats a great fit for general contractors that need the versatility to do a wide variety of jobs drives screws from 25 55mm in length quick slide button bit change and tool free screw length adjustment for ease when changing size or application has smooth drive operation and a variable speed trigger corner fit indexing technology allows placement of screws into tight places unreachable by any other auto feed screw guns added