Sea-Dog Round Base Rail FittingsSea Dog Round Base Rail Fittings are constructed of investment cast 316 stainless steel for corrosion resistance and durability. Installs with (3) #10 FH fasteners (not included); Stainless Tube Wall Thickness .049"; Available in 30, 60 and 90 Degree Angles; Dimensions:S-D-280300 30 Degree Round Base; Tube O.D.: 7/8"; Base: 2-5/8"; S-D-280600 60 Degree Round Base; Tube O.D.: 7/8"; Base: 2-5/8"; S-D-280900 90 Degree Round Base; Tube O.D.: 7/8"; Base: 2-5/8";