Constructed of high-strength, lightweight aluminum with two reinforcing ribs centered throughout the entire length of the post. Top & bottom of posts are fitted with custom molded caps to protect finished floors. A built-in channel runs length of the post allowing the collar to slide up and down with infinite height settings. Collar quickly locks in place with pressure lock T-handle. These 3" standards are compatible with 3-1/2" or 3" diameter floor sleeves. Made in the USA.