The ServoCity 2mm Pitch GT2 Pinion Timing Pulley (4mm Bore, 20 Tooth) is engineered for high-precision applications such as printers and XY tables. It features a dual-material construction with a steel flange and barrel for durability, while the rest is crafted from lightweight aluminum. Designed to drive a 6mm wide GT2 belt, it includes built-in shims to ensure smooth operation against bearings without contact with the outer race. This pulley is compatible with 4mm diameter shafts, offering reliable performance in demanding environments.