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Made in USA Prescott Plastics 3/4” (19.05 mm) Round Rubber Hole Plugs, Vinyl End Cap, Black Rubber Caps for Metal Tubing, Fences, Glide Protection for Chair Legs and Furniture (10 Pack) - Amazon.com
Uxcell 25pcs Round Rubber End Caps 1/4" 3/8" 1/2" 3/4" 7/8" Black Vinyl Cover Screw Thread Protectors Assortment Kit - Cable End Caps - AliExpress
Vinyl Rubber End Cap 3/8 ID X 1/2 Hole Depth X - Etsy
200pcs 3/8"(9.5mm) Round Black Vinyl End Cap Screw Thread Protectors Rubber Cover Caps - Walmart.com