concave saw blade 1.Extra service life and sharpness 2.Smooth cutting surface,high cutting speed Dia.(inch)Dia.(mm)Thread 4"10022.2, M14, 5/8’’-114.5"11522.2, M14, 5/8’’-115"12522.2, M14, 5/8’’-116"15022.2, M14, 5/8’’-117"18022.2, M14, 5/8’’-119"23022.2, M14, 5/8’’-11