RCK-56 Solid Carbide V Groove Insert Knife 29 x 9 x 1. 5mm for RC-1030 RC-1045, RC-1046, RC-1048, RC-1108, RC-1148 These industrial V Groove insert router bits were especially designed for applications including - Miter Folds - "create the perfect joint" - Signmaking and Lettering The innovative CNC tool design uses a high grade carbide insert knife which allows you to get two uses out of each insert. Once insert knife show signs of wear you can rotate the insert for a brand new cutting edge. Secure locking screw system ensures maximum safety and maintains cutting accuracy. CNC router requires quality hold downs to ensure the least possibility of material shifting during operation.