Double-End Adjustable Bullnose Starting Step 53-58" : C-8016-58Part Number: C 8016 58 Available in Red Oak 1 thick top tread Cove, shoe mouldings included Assembly is required Overall Height: 8 Tread Depth: 11 , and 12 on the curved ends Overall Length: The finished stair width plus 10 3 8 for the curved ends The 8016 58 step is recommended for stairs with a finished width between 53 and 58, and requires two curved finished ends.