3 Groove

3 Groove Insert Blades. Rotate for a razor sharp blade. Triangular inserts (X-Files) have 3 sides and stack together to create 3 cutting surfaces. Designed to hold a steady line while working on the arcades when used in conjunction with 4 groove inserts. Super strong inserts made from Tungsten Carbide with Titanium Nitride coated option to increase durability.