Upgrade your General 380 8" Jointer with Sheartak spiral cutterhead for the following benefits. * Better quality finish with no tear-out. All the inserts are angled along the helical in a staggered way and make shear-cut effects on even highly figured hardwood. * Noise is hugely reduced as the spiral cutter head keeps constant contact with the board with only a few knives. * All the cutters are made of solid tungsten carbide which is much harder and stayer sharp longer than high-speed steel blades. If one edge is chipped or dull, rotate it 90° for a new sharp edge. Each insert has four cutting edges and can be used four times. * Easy to set up. The indexable carbide inserts are precision ground to a very tight tolerance and are interchangeable. Loosen the screws, rotate 90°, and tighten the inserts in minutes. The inserts can be precisely positioned by the taper hole style locking. * Smaller carbide inserts remove shorter and thinner materials, which make dust extraction much easier. * For the long term, spiral cutter heads are cheaper to use and can pay for themselves in a very short time. Standard Kit Includes: * High tensile alloy steel cutter block * 40 Carbide Inserts Installed * 5 Additional Carbide Inserts * 5 screws * 1 Torx head T type key