Description No drilling required. Clamps to the base of the rail. Holder folds down flat when not in use. Can be padlocked in the active position. (Padlock Sold Separately.) Sign plate is NOT included. View OSHA-Mandated Blue Flag Sign Plates View All Compatible Sign Plates IMPORTANT: This sign holder is designed to accept 12”x 15” Aldon manufactured sign plates with item numbers starting with “6”. Other sign plates may require additional mounting holes to be installed by the customer. Aldon can install custom mounting holes upon request for an additional charge. Larger signs my interfere with rail when sign holder is folded down when not in use.
