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GT2 Timing Pulley to Suit Various RepRap 3D Printers Pulley 1 x GT2 Pulley: 20 Teeth Bore = 5mm H7 / 0.197 inches. 2 x M3 Grub Screws included Material: Aluminium Pulleys are to suit either GT2 2MR or GT3 2MR Belts