Our Cross-Over Sub, 4-1/2" REG Pin is engineered for versatility and durability. Adapt from your 4-1/2" API REG box with a pin made to the connection of your choice, up to 5-1/2" FH, ensuring seamless integration into your drilling setup. Choose between a Box or Pin configuration and opt for Wrench-Flats to suit your operational needs. With a robust overall length of 16", crafted from 4145 HT Steel, and a 2.25" ID Bore, this tool guarantees superior performance. Elevate your drilling efficiency and reliability with our top-tier products designed for the toughest challenges.