Totally maintenance-free propeller shafts developed for finer-scale models and submarines. The bearing housings on the motor side have self-lubricating bronze bearings and G-rings for water tightness. 300-00 and 300-01 can be shortened. The remaining shafts cannot be shortened, and have 1 x M4 screw and a coupling connection for the 106-20. A precision nut (F) ensures proper connection to the screw. Sleeves: Brass. Shafts: Stainless Steel (SS 304). Rear bearing: Delrin. Maximum RPM (revolutions/min.): 10,000. A = Tube Length, B= O.A. Length, C= Diameter, D= Cupling End, E= Prop end