HOW TO FIT: 2" (Two Inch) Outer Dimension Square Tubing (2X2) With Inside Hole Diameters (Id) From 1 3/4" To 1 15/16" ( 1.75" To 1.93") And Wall Thickness Of .040" - .123" (10-20 Gauge) EASY TO INSTALL: High-grade Prescott Plastics black ribbed plugs work great for preventing scuffs on wood floor or as protection glides on chair tips, bench feet, table legs, bar stool foot sliders, chair leg protectors, square tube end, patio furniture inserts, and much more. 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.