Casters of Oklahoma - Materials Handling Equipment Since 1986, Casters of Oklahoma, Inc. has been providing customers with casters from Albion, Caster Concepts, Colson, Darcor, Darnell, Jarvis and Shepherd. We also supply material handling from Roach We are more than a caster company. We also supply material handling equipment: conveyors, hoists, cranes, lift tables, pallet racks and industrial doors.