Made of 304 stainless steel with brushed finish, rounded square shape with central square hole for tube passing, all edges smoothly curved. Matched with square handrail posts and railing tube bases to conceal mounting screws and gaps on walls or floors for neat appearance. Waterproof and rust-proof, suitable for indoor and outdoor stair railings, balcony balustrades and glass railings. Rounded corners eliminate sharp edges for higher safety.