Comparison : Item # A0185, 200 Series 1:1 (Miter) Gear Ratio, 1.00 Inch (in) Shaft Diameter, and A Rotation Gear Drive
Item # A0186, 200 Series 1:1 (Miter) Gear Ratio, 1.00 Inch (in) Shaft Diameter, and B Rotation Gear Drive
Item # A0187, 200 Series 1:1 (Miter) Gear Ratio, 1.00 Inch (in) Shaft Diameter, and C Rotation Gear Drive
Item # A0188, 200 Series 1:1 (Miter) Gear Ratio, 1.00 Inch (in) Shaft Diameter, and D Rotation Gear Drive
Item # A0189, 200 Series 1:1 (Miter) Gear Ratio, 1.00 Inch (in) Shaft Diameter, and E Rotation Gear Drive