A. Pin to Box Sub Adaptor B. Pin to Pin Sub Adapter C. Pin to Pin Saver Sub D. Shock Sub -Subs and Adapters are machined of high quality 4140 heat treated steel. Many combinations of thread sizes and formation upon customer request. -Our Tool Joints are machined for water-well applications. 2" through 7-5/8" API, I.F. Mayhew, FEDP and any custom threads. -Breakout Subs & Drill collars are machined to fit the customer's needs and applications. Capabilities to handle collar lengths of up to 20 ft.