These aluminum, clamp-on mounting plates are pre-drilled specifically for the Taco Grand Slam and Sport Slam Outrigger Bases. Designed to fit up to 30" wide spans, they can be cut to accommodate shorter spans. The plates will fit 3/4" and 1" pipe and 3/4" oval schedule 40 pipe commonly used on T-Tops. It is also available undrilled for a variety of mounting options. The 710085 undrilled plates are sold individually, while the 710086 and 710087 are sold as pairs.