7 ft. long wall channel CM83. Removable side stall walls can be made using our 7 ft. long wall channel designed to accept standard 2 inch lumber (1 1/2 inch thick). Attach the wall channels to your support posts or walls and slide the lumber into the channels. Measures 7 ft. long x 1 3/4" wide x 1" deep. Color- Black Only This item can ship to your residence FREE! (4 piece minimum order for free shipping) CM83$15.00 Toll free order and help line 1-800-335-1880. OHIO RESIDENTS will be charged Ohio Sales Tax unless we have a OHIO SALES TAX EXEMPTION FORM on file. The form is available at the link on the left side of this page.