Item Type: Synchronous Wheel Kit Material: Aluminum Alloy, Rubber Timing Belt: Width: Approx. 6mm / 0.24in Spacing: Approx. 2mm / 0.08in Length: Approx. 5 meter / 16.4ft Number of Teeth: 20 Tooth Synchronized Wheel: Diameter: Approx. 16mm / 0.63in Inner Hole: Approx. 5mm / 0.2in Width: Approx. 16mm / 0.63in Number of Teeth: 20 Tooth Package List 1 x Timing Belt 10 x Timing Pulley 1 x Hex Wrench 1Synchro Wheel Kit: This synchro pulley kit is mainly used in 3D printer, at least 6 teeth are in contact with the pulley at a given time, reducing the chance of slippage. 2Aluminum Alloy Wheel: These synchronous wheels are made of aluminum alloy with high hardness and high accuracy, oxidation surface ensures good corrosion resistance. 3Rubber Timing Belt: Timing belt adopts rubber support, which has high toughness, stable transmission, good buffering capacity and low running noise. 4Combination Use: The GT2 pulley is used in conjunction with the timing belt, 20 teeth design, the belt teeth can enter the pulley groove smoothly and accurately. 5Applicable Scenes: Used for small mechanical transmission devices such as engraving machine, dishwasher, packaging machine, automobile, inkjet printer and conveyor, etc.