Usage Tips:Leading technology, suitable for underwater immersion, outdoor rain, power selection of water and underwater equipment.N45H high-performance magnet, high-quality high-temperature resistant copper wire, imported NSK stainless steel bearings, anti-corrosion and anti-rust treatment process, First-class waterproof, high efficiency and energy saving.vacuum filling: imported from Japan with high temperature resistance, strong adhesion, oxidation resistance, solidified waterproof glue pouring. Waterproof welding: PCB board solder joint glue curing process, lead glue encapsulation process, first-level waterproof and other tests. NSK imported stainless steel bearings: Japan's high-end NSK stainless steel bearings, anti-corrosion, anti-rust. stainless steel shaft: shaft body material SUS316, solid solution aging heat treatment process, shaft body Rockwell hardness 58-60.Anodizing process: aluminum alloy shell, anodizing process, fast heat dissipation and light weight. Colour:Black Material:metal Size:28.4*28.4*48.4mm Package Contents: 1 * motor 4 * Screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.