The ServoCity Dual-Bearing Timing Belt Idler Pulley (6mm Bore, 18.5mm Diameter, 9.5mm inside Width) is engineered with dual 6mm bore bearings and a polycarbonate pulley, designed to adjust the tension and direction of a timing belt. The pulley offers a smooth surface for optimal belt movement, while its flanges ensure belt security. The bearings are strategically positioned to allow for varied offsets, maintaining smooth rotation even under axial loads.