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Specifications: Material: Aluminum Alloy Color: Silver Brand name: CNBTR Diameter: 4.1cm/1.61 Inch Aperture: 1.2cm/0.47inch Thinkness: 1.6cm/0.63inch Step Dia: 2cm/0.79inch Overall Size: 4.1x1.6x1.2cm/1.61x0.63x0.47inch ( OD x T x ID ) Weight: 28g Features: 1.Fit timing belt: 0.3-0.5cm PU round belt. 2.Commonly used as a DIY non-powered spindle for small drills, milling machines and small lathes. 3.Made of Strong Aluminum Alloy with long service life. 4.Fixed Bore 1.2cm, Boss size: D2x0.7cm ,with two Accessory Fixed Screws. Package Content: 1 x V-shape Pulley Wheel The unique MPN label on each inner package, which confirm it passed the quality inspection and it is genuine item sold from our shop. Please offer it to us when you need assistance.