6291-PC : MO DONA 20" Vanity Frosted Glass Shelf with Rail Chrome Di mention e Installation for Drywall and Tile: Hold bracket up to surface and mark both screw positions. Measure 14" from first set th mark second set of screw positions. Use level to ensure strew positions are level. . Using drill, drill guide holes at each screw location. . Insert screw anchors {2) inch wall until flush with surface. . Attach brackets (3) to wall with lip up away from wall and install screws (4} into bracket. .