... 1 GCS conveyor ball, ball conveyor,ball transfer unit 2 use carbon steel, stainless steel, nylon 3 carbon steel is zinc RKM/GCS Conveyor ... stainless steel, carbon steel.3. GCS conveyor accessories includes conveyor chain, conveyor wheel, conveyor bearing, wheel chain, ball transfer unit ... any related question.Thanks! GCS Conveyor Ball Transfer Unit/ conveyor ball/ conveyor ball in tower shape or disc ...