Straight Flat Plate, Black, Anodized, Number of Mounting Holes 3, Overall Height 4 1/2 in, 21/64 in, Overall Length 1/4 in, Overall Width 1 1/2 in, Aluminum 6105-T5, Inside Corner Bracket Style Straight, 15 Series, System of Measurement Inch, Flat Plate, For Slot Width 21/64 in