The 15mm straight corner square reversible and indexable replacement carbide inserts have 4 cutting edges. And 1 standard hole for locating into your cutter heads. The 4 sides are of the same sharpness , its just like 4 sets of knives for your machine. Their solid carbide micro grain tips give superior tool life in a wide variety of materials for all general spiral planer head in hard woods and soft woods, the insert can be used for the heads of your jointer and planer. It will definitely be of great help and your excellent partner for your wood turning work. These carbide inserts are fully boxed in the standard plastic boxes for safe storage and transportation.We offer round, square, radius, and diamond shaped carbide inserts and cutters that fit many of the commercial wood working spiral helical planer heads or woodturning tools from companies like, Penn State Industries, Harrison Specialties, Craft Suppliers, Woodchuck Lathe Tools, Carbide Wood Turning Tools, and Sorby, among others. All of our inserts and cutters are manufactured to our specifications using high grade carbide with micro-grain size of 0.7-1.0 µm. These micro-grains are combined with a 10% binder that yields a hardness of 1650 HV10. They are then finely ground to a razor cutting edge with toughness and durability for long-lasting, smooth cutting in the most dense hardwoods.

• Made of solid tungsten carbide, providing you a better experience and durable use
• Designed for numerous spiral/helical planer cutter head system, Wood turning Tools
• Easy to replace your jointers and planers, excellent accessory for wood surfacing planing and turning work.
• 4 usable sides(15mm length X15mm width X 2.5 Thick-30* Cutting Angle), and all are of the same sharpness
• If one knife edge is dull or nicked, just turn it to another edge which greatly reduces you down time.

Made of solid tungsten carbide, providing you a better experience and durable useLA HARDWARE INC