The gazebo 12x20 comes with expansion bolts

【Upgraded Coated Frame】16x32 event tent features an upgraded frame made of high quality

Canopy Type: Heavy Duty Outdoor Canopy

4 X Panels (2x SideWalls and 2x roll-up doors with Zipper)

COBIZI 10'x12' Heavy Duty Hard Top Gazebo with Curtains & Netting SPC277 Heavy Canopy The gazebo 12x20 comes withProduct Features Ventilated Double Roof 10x12 gazebo features a heavy duty galvanized steel roof that provides better protection from harmful UV rays and promotes air circulation and wind resistance. You can even sunbathe under this hard top gazebo without worrying about getting sunburned. Can withstand heavy snow loads up to 18. 43 psf. Sturdy Aluminum Frame Constructed with durable powder coated aluminum that resists scratching, peeling, corrosion