The ServoCity 2mm Pitch GT2 Pinion Timing Pulley (6mm Bore, 20 Tooth) is designed for high-precision applications such as printers, sliders, and XY tables. It features a dual-material construction with a steel flange and barrel for durability, while the rest of the pulley is made of lightweight aluminum. This pulley is compatible with 6mm diameter or D-profile shafts and includes built-in shims to prevent contact with bearing races, ensuring smooth operation.