Description Aldon® Car Coupler Sign Holder fits into the coupler hole. Sign plate is NOT included. We have a wide variety of OSHA-mandated sign plates to choose from. View OSHA-Mandated Blue Flag Sign Plates Weight: 3 lbs. IMPORTANT: This sign holder is designed to accept 12”x 15” and 15”x 18” Aldon manufactured sign plates with item numbers starting with “6” or “7”. 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.
