9/32" Channel Width Meets FHA Specifications This CRL FHA Type J-Channel holds the mirror an 1/8 inch (3 millimeters) from the wall and the raised rib at the bottom of the channel prevents moisture from being trapped in the channel. This extrusion design meets FHA specifications and prevents damage to the silver mirror backing due to accumulation of condensation. It can be used with the Cleat and Top Channel as the third component of the CRL Mirror Mount System. Color: Polished Length: 12 ft (3.6 m) Thickness : .039 in (1.00 mm) Face: 5/16 in (7.9 mm) Minimum Order: 1 Stock Lengths (12 ft) Additional Product Information: Hint: Closed ends can be created by trimming back a potion of the channel, and bending back the front flaps to close off the ends. Note: Not recommended for schools, hospitals, or institutions where mirror edges should be protected on all four sides (see D1950).