thick wood door•To obtain the maximum weight capacity, all rail mounting fasteners must be mounted directly into solid wood•Do NOT install directly onto a drywall surface rail, 5 wall mounting brackets, 2 roller straps, 1 center guide, rail stops and 2 anti-jump block (door not included)•Door straps size: 1-1/2 in.•Quiet and smooth rolling wheels•220 lbs.5 in.