Round stainless steel 90 degree base for 1" tube. Casted type 316L marine grade stainless steel round base that accepts 1" tube or pipe. This item has (2) allen set screws that secures into the tube to hold in place. Their are (3) counter sunk screw holes to fasten this base. Height 1.75" Base Diameter 2.75" Top Opening for tube 1"