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The GT2 pulley with 20 teeth or grooves is one of the best choices for 3d printer construction. Compared with the T2.5 or MXL timing pulley, the GT2 pulley tooth profile is anti-backlash. As the rounded teeth of tooth and belt are engaged together longer providing a smoother transition between teeth. Features: 1. Bushing Design is much more convenient to install and disassemble. 2. The pulley of the precise design and drive shaft will work together perfectly. 3. Precise manufacturing and static balance can eliminate the pulley swing. Specs: - Type: 20-2GT-8 - Teeth Number: 20 teeth - Flange: double - Material: Aluminium Alloy - Bore of Timing pulley: Inner Bore 8mm,Outer Bore:16mm - Fit for Width of timing belt: 6mm Included: 5x 20 Teeth GT2 Aluminum Pulleys 8mm Bore 10x M4 Setscrews 1x Allen Wrench Note: Please confirm that the product is suitable for your machine or meet your needs before purchase.