Check the listing for details. spiral Cutterhead for Delta DJ-15, 6" jointer Model 37-150. Condition: New. Listed at 270.00 USD. The Delta DJ-15 is one of the most sought-after vintage 6" jointers out there. This is a spiral cutter head, manufactured by WGM Tool Works, to replace the stock traditional steel cutters. Each head features 4 rows of cutters for a total of ~28 (already installed on thecutterhead). Each cutter, or carbide insert, is solid carbide and will out-last your steel knives by a good margin. Each insert also has four cutting sides so just rotate the one side that gets dull and yours are ready to plane again. For more information, visit our website at: https://www.wgm-toolworks.com. If you are unable to find your cutterhead on Ebay, check out our website and/or email us and we may have it in stock. The advantages a spiral cutterhead offers include: Chip outs largely eliminatedExtremely noise reductionLong lasting cutter lifeNo sharpeningEasy replacement of cutters and no alignment required The last picture is an example of a jointed lumber surface through a spiral cutterhead. The package include: a spiral cutterhead with carbide cutter inserts installed3 additional spare carbide inserts3 additional spare Torx screwsa wrench for installing inserts