Hilong Holding Limited is an investment holding company principally engaged in manufacture and distribution of oil and gas drilling equipment and the provision of oilfield and offshore engineering services. The Company operates its business through four segments. The Oilfield Equipment Manufacturing and Service Provision segment is engaged in the production of oilfield equipment and provision of oil country tubular goods (OCTG) coating services. The Line Pipe Technology and Service Provision segment is engaged in the provision of services related to oil and gas pipe line and production of coating materials. The Oilfield Services Provision segment is engaged in the provision of well drilling services, OCTG trading and related services to oil and gas producers. The Offshore Engineering Services Provision segment is engaged in the provision of offshore engineering services and offshore design services.