30 Degree angled design can be applied to 25, 30, 35 and 40 degrees stair railing, black angle beveled washers provide a flat bearing surface 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). 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 corrosion-resistant which makes our balustrade hardware suitable for coastal installations. Black cable railing system requires hardly any maintenance. This black angle beveled washer is compatible with 1/8inch Invisible Receiver and Swage Stud Ends(B0B6BMV8C3, B07V66XZRV, B0BRK9924X) and 3/16inch Invisible Receiver and Swage Stud Ends(B0BDKGJYW3, B07VTKHWCJ). 40 Pack 5/16 inch 30 Degree Black Angle Beveled Washer. Colour:As Shown Material:Stainless steel Package Contents: 2 set x railing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.