Use this Upper Knife with Angle Carbide Tip on Juki models MO2504, MO2514, 1514, 3604, 3614, 3904 and 3914. The body of these knives are steel and the tip, edge or cutting portion of the knife is dipped in carbide which makes the cutting portion hold its edge longer. Measures 1-1/2" x 5/8".