Since 1973, Houston-based DSII has satisfied the most demanding

needs of well operators worldwide with innovative, cost-effective rig

manufacturing solutions and comprehensive field services. We are

an API 4F certified manufacturer (Certification #4F-0069) of masts,

substructures and crown assemblies.

DSII is a sound, privately-owned company consisting of 100+

employees, including certified welders, engineers, qualified

technicians and safety team.

As a certified API 4F manufacturer, we are confident that we can find

a solution that fits even the toughest requirements with innovative

design and manufacturing capabilities.

We are an API certified 4F manufacturer License 4F-0069