Custom Masts Our Products Custom Masts Meets or exceeds API 4F, base leg tilt adjustment screws, oversized hydraulic extension cylinder, automatic latch system, and more. View All Masts Custom Masts Variable Height & Load Specs Meets or exceeds API 4F, base leg tilt adjustment screws, oversized hydraulic extension cylinder, automatic latch system, and more. View All Masts Our Products Mast Retrofits We can retrofit all rig carriers made by other manufacturers to accommodate our custom-built Rig Works, Inc. masts. View All Masts