The ServoCity GT2 Pinion Timing Pulley 2mm Pitch (8mm REX® Bore, 30 Tooth) is designed for precision applications such as printers, sliders, and XY tables. It features a dual-material construction, utilizing steel in critical areas like the flange and set-screw hole, while the rest is crafted from aluminum. This pulley is compatible with 8mm REX® shafting, a standard in the goBILDA® build system, ensuring reliable performance in precision belt operations. The inclusion of two built-in shims allows for seamless operation against bearings without damaging the outer race.