Wood Chipper Knife Set (4 Blades) – Compatible with Morbark 2, 5, 6, M6R, 7, 8, 10, 12, M12, M12R, M12RX, 13, 14, 15, 17, 18, 20, 20-20, 20-30, 20-36, 1215, 1415, 2050, & More. This product is directly compatible with Morbark 2, 5, 6, M6R, 7, 8, 10, 12, M12, M12R, M12RX, 13, 14, 15, 17, 18, 20, 20-20, 20-30, 20-36, 1215, 1415, 2050, 2060, 2070, 2070XL, 2200, 2211, 2400, 30/60, 30/36, 50/36, 50/48A. 4-Pack: Set of four replacement knives/blades. 10.25 inches (266.70 mm) Length x 5.00 inches (127.00 mm) Width x 0.50 inches (12.70 mm) Thickness. Edge and Bevel Details: Primary Bevel Angle (degrees): 31. Edge Style: Double Edge. Bevel Style: Single Bevel. Superior Quality & Durability. Material: Modified A8 Tool Steel with a Hardness Lower Limit (HRc) of 53 and Hardness Upper Limit (HRc) of 57. About American Cutting Edge. We are a US-based leading supplier of machine knives and industrial razor blades. Trusted by industry professionals, we pride ourselves on supplying original equipment-quality replacement wood chipper blades, knives, grinding teeth, anvils, and other replacement parts and kits. It is common for knife dimensions to change between years and models of chippers. Always measure your original knives to make sure they match what you are ordering.