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 23/64inch (9mm) and max for 5/16inch (8mm) thickness cable railing hardware kit. They can be used in combination with our 8mm thick terminals: B0CPKZZJRW Size & Compatibility: Angle washers designed with an inside diameter of 0.35inch (9mm), and an outside diameter of 0.63inch (16mm). which are Perfect for an invisible system kit to get a professional and finished appearance staircase project. Marine Grade SST316 Material: Our beveled angle washers are made from marine-grade SST316 material, which has super strong ability on rust resistance and corrosion resistance, and it's to resist heavy weather. Easy Installation: These washers are designed for beveled angles, and will not get deformed easily thanks to their sturdy structures. Additionally, they are extremely beginner-friendly and can be easily installed, making them perfect for anyone attempting 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 . Material: Stainless steel colour: Silver Package Contents: 15 x deck railing kit 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.