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Amazon.com: Prescott Plastics 1" Inch (25.4 mm) Square Plastic Hole Plugs Inserts, Black End Caps for Metal Tubing, Fences, Glide Protection from Chair Legs, Furniture and Floors (Pack of 10) : Industrial
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Amazon.com: Prescott Plastics 2" (50.8 mm) Square Plastic Hole Plugs, 2x2 Square Tubing Inserts, Black End Caps for Metal Tubing, Fences, Glide Protection from Chair Legs and Furniture (4 Pack) : Industrial
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Plastic Blanking End Caps | Plastic Square Cap Ends | Plastic Inserts | Tool Parts - 10/50 - Aliexpress
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