Replacing Your Knives Keeps Your Jointer Cutting at its Best. \nShopsmith hardened steel knives are precision match-ground to Shopsmith's exacting standards and come in a set with three knives. Our rigid quality control requirements ensure that every knife in the set is exactly the same size, with the same precision edge bevel and tapered sides to guarantee a perfect fit and easy adjustment in your Cutterhead. This assures smooth and accurate cuts! The High-Speed Steel cutting edge guarantees long life. Once the knives are ground and honed to produce a razor-sharp cutting edge in our machine shop, they are treated with a special rust preventative solution for lasting serviceability. \n \nBuy a spare set of jointer knives to keep you working in the event of a nick or other knife damage. \nWe recommend that you always have a spare set of knives on-hand, in the event of accidental nicking. This way, down time will be kept to an absolute minimum, and you'll be able to continue working on your project with minimal interruption. \n \nCheck Your Jointer Wedges for damage or resin build-up for better operation and fewer chip-outs \nThese wedges are important for the efficient operation and chip formation of your Jointer�s Cutterhead. A smooth top surface is critical for proper chip formation. Smooth and damage-free tapered sides are absolutely necessary to lock the knife safely in the Cutterhead and smooth knife adjustment. Sold in 3-packs. \nNOTE: Only fit Jointers manufactured after January 1999. \n \nUpgrade to the Newest, Most Efficient, Jointer Cutterhead Design. \nUpgrade your old cutterhead (if made before January 1999) to the high efficiency Jointer Cutterhead. Efficiencies are gained by a larger diameter head, longer, full-width wedges and less knife protrusion. This combination of features create a smaller easier to cut chip. The New Cutterhead Assembly comes with Knives and wedges assembled. The Bearings installed on the shaft and Bearing Blocks pressed on the bearings. This cutterhead assembly will bolt directly into your old Jointer, ready to set the knives to your tables.