Fixed Angle Clamp-On Center Rigger TACO Center Riggers are constructed from 316 marine grade stainless steel. Installation is simplified by the use of a clamp-on mount, that fits either 3/4" IPS and 1" IPS pipe found on the hoop of most standard T-Tops. Uses 1-1/8" mount outrigger.This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.