Sheartak Spiral Cutterhead for Scheppach HM2 Kombi Jointer Planer with 55 Carbide Inserts Woodworkers are now retrofitting spiral cutterheads to their old planers, jointers for the following advantages. * Smoother Finish with no tear-out. Each knife sits at a slight angle and produces shear-cut . Spiral cutterhead planes board in a staggered way which is much better than single straight cut. The combined shear and staggered cut eliminates tear-out and leaves a glossy surface finish on even highly figured hardwood. * Noise is hugely reduced as spiral cutterhead allows a few knives to cut in a staggered way. * More than 10 times the life use of high-speed steel. The 15x15x2.5mm inserts are made of sintered tungsten carbide which is much harder than high-speed steel. Each insert has four edges. * Easy to change. The knives are precision ground to a tolerance of +/-0.0004" or +/-0.01mm and are interchangeable. Loosen the screw, rotate 90° for a new edge, tighten the insert in minutes. * Dust extraction is easier. Spiral cutterhead produces thinner and shorter chips. * Low cost to use. Spiral cutterhead produces smoother finish, reduces or eliminates sanding work, don't require sharpening. It will pay you off in a very short time.