1” X 1 1/2" Rectangle Tubing Plugs Rectangular Tube Plugs Internal Fit Rectangular Tube Inserts & End Plugs Top Size: 1” x 1.5" (25mm x 38mm) Over Height: 5/8" (17mm) Compatible Inside Square Tube Dimensions: (.84 x .93) X (1.34 X 1.43) Tube ID Compatible Thickness Range: 14-20 gauge Size is based on outside dimensions of rectangle tubes. Plug insert end will be about 1/8" smaller to fit ID dimensions. Top dimension of plug will be the same as the OD dimension of the tube. The ribs will make up for the variance of the ID dimensions based on tube wall thickness. Please be sure to measure your tube dimensions for correct fit.