These insert flush trim router mills brings the benefits of helical staggered cutting. Simply turn the insert 90° degree to reveal a new edge and each reversible carbide insert has four edges. No hassle and cost for resharpening any more. Superior cutting surface finish. It's ideal for routing softwood, hardwood, chipboard and MDF.Use the flush trim router bit for laminate work, template and pattern work. For template application, the bearing follows the template, while the carbide insert edges do the trimming work. Item No. Trim Length Shank Diameter Cutting Circle Insert size No. of Inserts 80411003 30mm 1/2" (12.7mm) 30mm 12x12x2.2mm 5 80411004 40mm 1/2" (12.7mm) 30mm 12x12x2.2mm 5 80411005 50mm 1/2" (12.7mm) 30mm 12x12x2.2mm 8 80411006 65mm 1/2" (12.7mm) 30mm 12x12x2.2mm 10 80411007 70mm 1/2" (12.7mm) 30mm 12x12x2.2mm 11 80411008 75mm 1/2" (12.7mm) 30mm 12x12x2.2mm 12 80411009 80mm 1/2" (12.7mm) 30mm 12x12x2.2mm 13