RV Trailer 4" T-style Entry Door Catch Holder All Metal with Bracket New. Features and Specifications. What's Included: One door catch/holder assembly (includes both sides: arm side and female catch side). Material: Heavy Duty Steel. Rust Protected: Zinc coated for rust and weather protection. Arm Length: 4" long arm. Mounting Base Size: Each mounting base is 3" by 1-3/4". Note: Screws not included. Warranty: One Year Warranty. Replace that old, cracked door holder with this brand new, premium heavy duty door catch (holder). It's perfect for holding open your RV, trailer or compartment door. Arm length is 4", and base plate mounts are each 3" x 1-3/4" (mounting screws not included). Includes female bracket. All Metal steel construction with zinc coating for rust and weather protection. This is not the cheap quality plastic catch you may see others selling, this is a strong steel catch that is built to last. This premium product is covered by our One Year Warranty.