A(Inside diameter) = 5/16inch, B(Outside diameter) = 5/8inch, Angle = 30 Degree. 30 degree black beveled washer fits for 5/16inch Threaded Stud Ends (1/8inch & 3/16inch Cable Railing Kit). The angle stair washer is made of Stainless Steel, high tensile strength and anti-fatigue strength Weatherproof. It is which makes our balustrade hardware suitable for coastal installations. Black cable railing system requires hardly any maintenance. 30 Degree angled design can be applied to 25, 30, 35 and 40 degrees stair railing, black angle beveled washers provide a flat bearing when attaching fittings at angled stair terminations. This black angled washer is perfect for planning your cable railing project, providing beveled washer for the angle of your garden, stairs and aisle beside for indoor or outdoor applications(wood, steel, aluminum post on deck railing). This black angle beveled washer is compatible with 1/8inch Receiver and Swage Stud Ends(B0B6BMV8C3, B07V66XZRV, B0BRK9924X) and 3/16inch Receiver and Swage Stud Ends(B0BDKGJYW3, B07VTKHWCJ). 20 Pack 5/16 inch 30 Degree Black Angle Beveled Washer., Weight: 0.4188782978 Pounds, Manufacturer: Xnuiasqe