This RC boat flexible shaft sleeve set (5pcs) is designed for use with 3.18mm, 4mm, and 4.76mm flex shafts. Made from high-quality durable plastic, these sleeves ensure smooth shaft alignment, reduce vibration, and extend the service life of your boat's drive system.

Available specifications include:

3.18mm flex shaft sleeve: inner diameter 3.5mm, outer diameter 4.3mm
4mm flex shaft sleeve: inner diameter 4.5mm, outer diameter 5.35mm
4.76mm flex shaft sleeve: inner diameter 5.0mm, outer diameter 6.0mm

These one-piece shaft sleeves are compatible with brass or stainless-steel tubes (please confirm dimensions before use). Ideal for RC racing boats, scale model ships, and electric brushless setups, offering reliable performance and ease of installation.