HOW TO FIT: 1 1/2” (Outside dimensions) Square Plastic inserts will fit inside hole dimensions of 1 1/4" To 1 7/16” Inside dimensions) with a wall thickness 0.040 to 0.122” (10-20 gauge). NOTE: It will not fit a 1 1/2" opening. EASY TO INSTALL: Our 1.5" 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, square tube end, 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. Prescott Plastics heavy duty high grade thick wall black plastic finishing plugs, end cap for 1 1/2" outside diameter steel square tubing. These fit inside tube diameters from 1.22" to 1.45" (1 1/4" to 1 7/16"). These heavy duty plastic plugs for square tubing are manufactured to provide a secure fit on multiple tube gauges. ►Package content - 4pcs 1.5" Square Plastic Plug. ►These premium plastic plugs work great for preventing scuffs on wood floor or as protection glides on chair tips, exercise equipment , bench feet, table legs, bar stool foot sliders, outdoor swing, trailers, fence/fencing railing posts, chair leg protectors, patio furniture inserts, water sports, and much more. They are also designed to hold up against impact abuse, and harsh weather conditions. ►Easy to install and secure fit. ►Tips: ▷Please measure the inner/out diameter of your Furniture for proper fitment. ▷Check our other listings for different sizes.