Andis UltraEdge detachable blade - 10: leaves hair 1/16 inch (1.5 mm). Andis UltraEdge detachable blade - 30: leaves hair 1/50 inch (0.5 mm). Andis UltraEdge detachable blade - 40: leaves hair 1/100 inch (0.25 mm). Andis UltraEdge detachable blade - 40 SS: leaves hair 1/100 inch | 0.25 mm Andis UltraEdge detachable blade - 9: leaves hair 5/64 inch (2 mm). Andis UltraEdge detachable blade - 50 SS: leaves hair 1/125 inch (0.2 mm). Andis UltraEdge detachable blade - 4 FC: leaves hair 3/8 inch (9.5 mm) long. Andis UltraEdge detachable blade - 8 1/2: leaves hair 7/64 inch (2.8 mm) long. Andis UltraEdge detachable blade - 3 3/4: leaves hair 1/2 inch (13 mm) long. Andis UltraEdge detachable blade - 7: leaves hair 1/8 inch (3.2 mm) long. Andis UltraEdge detachable blade - 5/8 HT: HT means high - leaves hair 5/8 inch (16 mm) long. Andis UltraEdge detachable blade - 3/4 HT: leaves hair 3/4 inch (19 mm) long. Andis UltraEdge detachable blade - 3 3/4 FC: leaves hair 1/2 inch (13 mm) long. Andis UltraEdge detachable blade - 15: leaves hair 3/64 inch (1.2 mm) long. Andis UltraEdge detachable blade - 4 /9.5 mm: leaves hair 3/8 inch (9.5 mm) long.