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Dcs Drill Collar Slips Wellhead Tools for Oil Equipment Well Drilling. Wide Size Compatibility: Accommodates drill collars from 3 inch to 14 inch O.D. across three models. ISO 9001:2000 Certified: Manufacturing process certified under ISO 9001:2000 for quality assurance. Durable Material: Constructed from Zg35mrmo material for robust performance in drilling. Global Export Experience: Products exported to USA, South America, Africa, Japan, and Singapore. Strict Quality Control: Experienced QC team performs strict inspection before every shipment. Fast Delivery Options: 25 days production time; only 2-3 days if stock is available for requested size. Comprehensive Warranty: 1 Year warranty with free replacement for confirmed quality failures.