Fit for 33-Degree Stairs: These 33-degree beveled angle washers are specifically designed to be placed between the cable railing kit and post on 33-degree staircases. These washer holes are 23/64 inch (9mm) and max for 5/16 inch (8mm) thickness cable railing hardware kit. They can be used in combination with 8mm thick terminals. Size & Compatibility: Angle washers designed with an inside diameter of 0.35 inch (9mm), and an outside diameter of 0.63 inch (16mm), which are perfect for an invisible system kit to achieve a professional and finished appearance for staircase projects. Marine Grade SST316 Material: Our beveled angle washers are made from marine-grade SST316 material, which offers excellent rust resistance and durability, making it suitable for harsh weather conditions. Easy Installation: These washers are designed for beveled angles and will not deform easily due to their sturdy structure. Additionally, they are beginner-friendly and can be easily installed, making them ideal for anyone undertaking a clean and neat cable railing project as a DIY endeavor. Wide Application: The 33-degree design of the washer is perfect for most standard stairways and can be used with a stainless steel invisible receiver and wire rope. Also compatible with wood, steel, and aluminum post-on-deck railings for versatile application options. Material: Stainless steel Color: Silver Package Contents: 15 x deck railing kit Only the above package content is included; other products are not. Note: Light reflection and different displays may cause slight color differences between the image and the actual item. Measurement may vary by +/- 1-3cm.