Fangrui Product Details Straight Slotting/cutting/bending Top Edge Trimming, Installing Straight Edge Backers, Fixing Screws, Smooth Slotting And Cutting Fix The Center Of The Circle Milling, Milling The Circle Groove/cutting The Circle Block/engraving The Center Of The Circle, Remove The Backer, Fix The Center Screw, Nail The Nail And Push The Trimming Machine To Easily Milling The Circle Upgrade The Cylindrical Trimming Function Is Diverse, Practical And Fast, Use The Arc End To Back , Overlap The Base,easily Achieve Edge Trimming Different Models Match Different Hole Positions, And Choose The Appropriate Hole Position According To The Corresponding Model To Meet Different Needs The Backer Can Be Rotated 180 And Can Be Used At Both Ends. Rotate And Turn Around To Backer, Different Use Effects,simple And Removable Multi-form Available, The Backer Device Can Loosen The Screws And Rotate For Use, And The Overall Removable Storage Please Note: There Is A Slight Color Difference Or Discrepancy In Kind, It Does Not Affect The Us