【Applicable size】：Black plastic plug size is 1"x1”, it fits 1" outside diameter square tubing; Flexible ridges allows these plugs to hold firm and in place and also allows them to fit most of 1” square tube; please measure your tube size before purchasing 【FLOORING PROTECTION】:Provides long lasting protection， great for preventing scuffs on wood floor or as protection glides on chair tips, bench feet, table legs, bar stool foot sliderschair leg protectors, patio furniture inserts, and much more. 【Easy Install】:The threaded inner plug can be used as a durable solution for home or outdoor projects, including replacement of fence/door railing covers, trailer frame ends, rod tube rod caps, wrought iron steel decorative plugs or any square opening. Not easy to deform, firmer, not easy to fall off, easy to install 【Wide Application】 : Square plugs perfect for fence post pipe, chair, table, stool, office and patio furniture, Fitness Equipment ends, Square plugging holes in various pipes, prevent scuffs and slides reduce noise and damage. 【High Quality and Beautiful】：Black ribbed plugs work great for preventing scuffs on floor, hold up against impact abuse, and harsh weather conditions, firmer, beautiful and durable long lasting.