Universal 1 Inch Round Plastic Plugs, 12/Pack Round tubing end caps outside diameter is 25mm/1.0inch, inside diameter is 15mm/0.59inch Fit for 1 inch (OD) round tubing outside diameter rectangle tubing For inside hole diameters (ID) from 0.75 inch to 0.93 inch(3/4 inch to 15/16 inch), with a wall thickness 10-20 Ga Black Plastic Sold 12/Pack
