Trakpower LiPo 2S 7.4V 2400mAh Rx Pack Flat w/Universal FEATURES: Machined For Accuracy, Then Polished To A Gleaming Finish. Easy To Install, Having A Bolt-On Design, Centers Each Spinner Perfectly On Its Baseplate. Spinner Cone Is Recessed To Mate Into the Spinner Backplate. The Rear Of The Spinner Is Flat, Without An Overhanging Cone. Includes Black 10-32 Bolt That Holds Spinner Cone to Backplate. Adapter Kits For Different Engine Sizes Are Available Separately. (See COMMENTS) INCLUDES: One Aluminum Spinner Cone One Aluminum Backplate (See Specs For Sizes) One 10-32 x 1 Mounting Bolt One Box with Installation Instructions and Safety Tips REQUIRES: One Spinner Adapter Kit (See COMMENTS)