Precision stepped blades have a 0.002 inches step for accurate settings. Blades from 0.004 inches to 0.027 inches (0.102 - 0.686mm) are approximately 1/2 inches wide by 3-1/4 inches long. Low gauge blades size are from 0.004 to 0.025 inches. High gauge blades size are from 0.006 to 0.027 inches.