Better Design: Comes with 5mm inner diameter, this 80T GT2 high accuracy synchronous pulley is applicable to 6mm width timing belt. GT2 Synchronous Wheel 80 Teeth 5mm Bore Alloy Steel Timing Belt Alloy Steel Timing Wheel Synchronous Wheel 80 Teeth GT2 Alloy Steel Dual Flange Timing Belt Pulley 5mm Bore For 3D Printer CNC Lathe 6mm Width Belt(Silver 80 Tooth GT2 Pulley Precision-engineered 2GT 80T aluminum alloy synchronous wheel designed specifically for Voron 2.4 3D printers. Features 80 teeth for smooth transmission, easy installation with included screw holes, and comes in three stylish colors: Red, Black, and Silver. This durable pulley ensures stable operation and precise linear motion for consistent 3D printing results Easy to Install: Compact in size and light weight as well, the installation can be quickly finished with hex wrench and M4 screw hole. Precision-engineered 2GT 80T aluminum alloy synchronous wheel designed specifically for Voron 2.4 3D printers. Features 80 teeth for smooth transmission, easy installation with included screw holes, and comes in three stylish colors: Red, Black, and Silver Specification: Item Type: Synchronous Wheel Material: Alloy Steel Pitch: Approx., Approx., 2mm / 0., 08in Number of Teeth: 80T Outer Diameter: Approx., 55mm / 2., 17in Flange: Dual Flange Fixing: 2 x M4 Pulley Timing Diameter: Approx., 5mm / 0., 2in Applicable Belt Width: Approx., 6mm / 0., 24in Package List: 1 x Synchronous Wheel 1 x Hex Wrench