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click the "detailed image" link on the left to see the drawing to determine which size you need.
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available in 3 sizes:
Size A $11.11 each fits shaft diameters: 3/4" 7/8" 1" 1-1/8" 1-1/4" 20mm 22mm 25mm 30mm
Size B $11.86 each fits shaft diameters 3/4" 1" 1-1/4" 1-3/8" 1-1/2" 25mm 30mm 35mm 40mm
Size C-D-E $17.40 each fits shaft diameters 1-1/2" through 3" and 40mm to 75mm
Be sure to select your size from the drop down box.