Using this product our team found that the groove cutting process became faster and smoother than ever before... The multi-layer coating ensures the inserts don`t wear quickly, thus providing the required precision throughout. With a price that's hard to beat, the OSCARBIDE Carbide Grooving Inserts Multilayer is a must-have for anyone in the cutting industry. The only downside we noticed was that the inserts may not fit ALL types of cutting machines..