Description: APPLICABLE: Used for modification, remote control boat, boat models, fishing gear boats, boats, lifeboats, underwater robots, etc. DURABILITY: With fine workmanship, it has compact structure , durable for long term use. HIGH PERFORMANCE: A specially designed propeller and nozzle provides efficient, powerful thrust .The underwater thruster is high performance ensures better work efficiency. PLEASE NOTE: CW stands for OBVERSE, CCW stands for REVERSE. If you need to use ONLY ONE propeller, please choose CW; Need to install 2 propellers, please use a pair of propellers (CW&CCW). MATERIAL: Nylon and metal. Size Chart: 14.35cmx14.2cmx16.5cm/5.65inchx5.59inchx6.50inch Package Includes: Optional Package 1RC Boat Underwater Thruster or 1 PairRC Boat Underwater Thruster