HDD Crossover Subs Reliable HDD Drill Tooling and Supplies Crossover Subs HIGH-QUALITY, 100% AMERICAN MADE Our crossover subs are manufactured in API- and ISO-certified facilities specifically for the HDD industry. Each sub is treated with phosphate on the threads, and an ID band is stamped for easy identification. Our Selection Includes: Box x Box Box x Pin Pin x Pin Crossover Sub Rig Saver Sub Spider Sub Weeper Sub Bit Sub & More Contact Us