About SPD Rollers: The SPD range of conveyor rollers includes both steel and HDPE carry and return rollers. Also available are rubber disc impact and return rollers. The rollers and frames are manufactured to different standards or design according to your special working condition requirements with some innovative and maintenance saving designs. Our rollers are fitted with quality deep ball ZZ C3 bearings for maximum life. Belt Widths of our SPD rollers range from 400-2000. Larger sizes available on request. Roller lifespan could be assured� 30,000 to 50,000 hours under normal working condition and maintenance.