Inside diameter= 1/4inch/6.6mm, Outside diameter= 5/8inch=16mm, = 30 Degree. Suitable for 1/8inch and 3/16inch wood/metal cable railing kit. This beveled washer is made of Stainless steel, which is durable, rustproof, anti-corrosion, and resistant to extreme weather. 30-degree stainless steel angled beveled washers are designed for termination on end posts that have angled, or offset holes on stair railings, suitable for short and long stud terminals, and even for terminals. these stainless steel angled beveled washers are suitable for indoor or outdoor cable railing. 30-degree angled washers are easy to install for beginners, you can DIY your stair railing to more professional and beautiful. 10 Pack 30 Degree Beveled Washer. You can use it with the corresponding cable railing kit. Colour:silver Material:Stainless steel Package Contents: 1 set x Beveled Washer Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.