Sea-Dog Round Base Rail Fitting - 90 deg Low. Designed for use with 7/8" or 1" OD stainless tubing with a wall thickness of .049". Includes set screws where appropriate. Installs with three #10 or 1/4 FH fasteners (not included). Features of Sea-Dog Round Base Rail Fitting - 90 deg Investment Cast 316 Stainless Steel 90 Round Base Tube Outside Dimensions: 1" Installs with three #10 or 1/4 FH fasteners (not included) Package Contents: Sea-Dog Round Base Rail Fitting - 90 deg Sea-Dog 280901-1: Round Base Rail Fitting - 90 deg Low