The 93-006 18" notched mower blade is a precision-engineered replacement part that directly replaces 103-5844-S, featuring a direct-fit design that enables seamless installation without modifications for 66", 52" and 44" cutting deck models from select outdoor power equipment lines. Constructed with premium heat-treated high-carbon steel, this blade is individually straightened and hardened to deliver consistent, clean cuts while resisting wear, bending and dulling for extended service life; its notched design enhances mulching efficiency for improved bagging and discharge performance, and the 1-3/16" air lift optimizes grass clipping evacuation and cutting power with each revolution. It has a 5/8" center hole, 2.5" width and 0.55" thickness to ensure exact dimensional matching with original equipment, fitting 66" decks (2 blades required), 52" decks (3 blades required) and 44" decks (3 blades required) for reliable mounting and balanced rotation during operation. The durable black finish provides corrosion resistance against outdoor moisture, grass clippings and debris, protecting the blade from rust and extending its usable life, while the precision-ground cutting edges ensure sharpness out of the box and consistent performance through repeated use. Built to meet strict OEM specifications for lawn mower cutting blades, it is recommended to refer to the original equipment owner's manual to confirm proper fit and installation guidelines for your specific machine, including torque settings and blade orientation for safe and optimal operation.