Recess-It Niches are produced of a corrosion resistant alloyed aluminum with an elastomeric-waterproofing and anti-fracture coating combined with an aggregate bonding base. Finished materials, ceramic tile, marble, granite, etc. can be applied immediately after product installation utilizing standard mastics or thin-set. This Niches face measures 13-1/4" x 21-1/4", back measures 12-3/4" x 20-3/4" and is 3-7/8" deep. The Shelf is supplied with (6) wall fasteners which may be used with/without pre-installed wood blocking & (1) Floating Shelf which measures 13" x 3".