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The Design House Terrace Knob. Designed for left or right-hand doors, this knob fits the two most common backsets in the U.S. (2-3/4 inches and 2-3/8 inches). Use this knob on standard 1-3/8 inches and 1-3/4 inches thick doors with a cross bore 2-1/8 inches in diameter, or an edge bore 1-1/16 inch in diameter. (1 inch × 2-1/4 inches radius corner faceplate).