Doorway thresholds come in three standard lengths (24, 30 and 36 inches) and widths from 3 to 6 inches, all 3/4 inch thick. Measure jamb to jamb for the length and across the floor gap for the width (step-by-step guide), then pick your size:
36 x 3 Inch Marble Threshold (3/4 in Thick) · 36 x 4 Inch Marble Threshold (3/4 in Thick) · 36 x 5 Inch Marble Threshold (3/4 in Thick) · 24 x 4 Inch Marble Threshold (3/4 in Thick) · 36 x 6 Inch Marble Threshold (3/4 in Thick) · Custom Size · 24 x 3 Inch Marble Threshold (3/4 in Thick) · 24 x 5 Inch Marble Threshold (3/4 in Thick) · 24 x 6 Inch Marble Threshold (3/4 in Thick) · 30 x 3 Inch Marble Threshold (3/4 in Thick) · 30 x 4 Inch Marble Threshold (3/4 in Thick) · 30 x 5 Inch Marble Threshold (3/4 in Thick) · 30 x 6 Inch Marble Threshold (3/4 in Thick)
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