Product Name: CRS-A/B/C
Description: a peripheral grooved pulley can rotate around the axis of the small wheel. Can rotate around the central axis of the grooved disc and the disc across the flexible cable (rope, tape, rope, chain, etc.) can be formed around the central axis of rotation of the simple machine called a pulley. Pulleys: with the move from the fixed pulley pulley pulley composed of both effort but also change the direction of the force.
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