B - Means loose Match( larger 0.05mm than Standard) A - Means tight Match( small 0.05mm than standard) Gear Diameter: (Teeth +2) * modulus = Diameter of Gear Modulus: 0.5 Aperture 1.5/2/2.5/3, Weight: 0.06834330122 Pounds, Manufacturer: Blisfulhoks
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