This is an original USN USMC Helicopter Pilot TACTAIR Rotorbrake Assembly, Part  No. 9011. This is used by the pilot and crew to slow down and stop the main rotor blade from spinning when on the ground. It is 14 x 3 x 7 inches.  This item is being sold as a collectible.  Payment must be received within 10 days of auction closing unless prior arrangements have been made. Buyer to pay shipping . AZ residents add 6.7% sales tax. If you have any questions please contact me via e-mail before bidding. Thank you for your interest in my auctions