OLFAs heavy duty snap-off replacement blades are meticulously scribed to provide accurate, predictable and consistent snaps. These blades are constructed of the finest quality tool steel in a precise multi-step process for unmatched initial cutting power and edge retention. Blades are sharpened to a 59-degree angle which compliments the natural angle the hand assumes when holding a cutter, helping to make it impossible for the blade to break as a result of the cutting force. This angle also gives the blade a great deal of flexibility and is perfect for snapping off the used segments cleanly, leaving a perfect new cutting edge. OLFA replacement blades provide instant sharp edges in an extremely economical way.