Three Knife Trimming Machine at Best Price in India Three Knife Trimming Machine at Best Price in India Three Knife Trimmer: The perfect solution for cutting books and magazines on all the 3 sides in one go. Get a perfect 90 degree cut every time. Inline 3 knife trimmer for wire stitched and perfect bound copies: Online 3-knife and 4-knife trimmerNow cut single copies. Fed by automatic feeder. Copy size up to 510 mm x 320 mm. Long book blocks can be split by a 4th knife. Runs at 8,000 copies per hour. Three knife trimmer manufactured by Pramod Engineering