GT2-6mm Belt Width 36 teeth 6.35mm Bore Aluminum Timing Pulley. Aluminum 36T GT2 timing pulley has high quality shiny surface appearance and robust construction, longer working life. he rounded teeth of this tooth and belt are engaged together longer providing a smoother transition between teeth, good performance for 3D printers. Applications include 3D printer, CNC and other robotics with timing belt pulley, GT2 timing belt pulley system especially suited for linear movement and positioning.