Fangrui Product Details [applications]sometimes, When Drilling Holes In Posts For The Cables, Wood Tends To Splinter Off, Leaving Less Than Holes. The Sleeves Have A Silver Flange On Them Which Covers Any Rough Edges Of The Drill Holes. This Angled Protector Sleeve Is For Planning Your Cable Railing Project, Providing Beveled Protector Sleeves For The Angle Of Your Garden, Stairs And Aisle Beside For Indoor Or Outdoor Applications. [size]stair Cable Railing System. The Sleeves Will Help Your Cable Railing Maintain Proper Tension Over Time. [t316 Stainless Steel]the Cable Railing Angle Beveled Protector Sleeve Is Made Of Stainless Steel T316 Marine Grade, High Tensile Strength And Anti-fatigue Strength Weatherproof. It Is Corrosion-resistant Which Makes Our Balustrade Hardware Suitable For Coastal Installations. Cable Railing System Requires Hardly Any Maintenance. This Wood Post Protector Is Suitable For Outdoor Or Indoor. [easy To Use]this Stainless Steel Angled Post Protector Can Be Used On Wood/composite Post