Features:* 100% brand new and high quality* Made of high quality material, durableand practical to use* 8 PCS GT2 16T hole 5mm timing pulley and 5m belt ForRepRap ForPrusa ForMendel For3D printer* Please note that this is a 5mm hole wheel. These pulleys can be used forUltimaker, forDitto or other for3D Pinter designs with similar kinematics. An aluminum GT2 pulley and an Allen key. Information about the printer firmware parameters see the drawing for dimensions and calculation steps per millimeter.* For 3D printing applications, the GT2 2mm belt system is better than T5, T2.5, it provides better smoothness and positioning accuracy, resulting in better print qualitySpecification:GT2 Pulley:* Tooth Number: 16* Pitch: 2mm(Approx.)* Hole Diameter: 5mm(Approx.)* Flange: Double* Tooth Width: 7.5mm (very suitable for 6mm timing belt)* Fixed Screw: M3* Material: AluminumGT2 Belt:* Colour: Black(As pictures show)* Pitch: 2mm(Approx.)* Width: 6mm(Approx.)* Material: Fiber-Reinforced Rubber* Length: 5M(Approx.)Package Contents:1*GT2 Belt8*GT2 Pulleys16*Screws1*Wrench (As pictures show)Note:1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2.Please allow slight manual measurement deviation for the data.