HOW TO FIT: 3/4" .75 OD square tubing (.75x.75) with INSIDE hole diameters (ID) from 1/2" to 11/16" (.50" - .69") and wall thickness of .042" - .125" (10-20) Gauge) EASY TO INSTALL: Our 3/4" snap in plug is a long-lasting solution for many household or outdoor projects including: Fence/Fence Railing Posts, Gate Rail Post Covers, Trailer Frame End Posts, Pole Pipe Rod Caps, Metal Bike Fittings, Wrought Iron Steel Finishing Plugs. FLOORING PROTECTION: Prescott Plastics black ribbed plugs prevent scuffs on wood and other natural floors. They provide a protective “glide” for chair tips, bench feet, table legs, bar stools, patio furniture, and other furniture designed for furniture inserts and plugs. PREMIUM QUALITY PLUGS: Our plugs and inserts are designed to hold up in all harsh weather conditions and high traffic areas. MADE IN UK: These Plugs are specially designed and produced in UK to maintain quality, endurance and durability.