Mentor 720.64 Brass Shaft Coupling - Inside Diameter 6mm One End 4...

Mentor Rigid Brass Shaft Couplings - Inside Diameters 6mm & 4mm - Mentor 720.64, This shaft coupling from Mentor is a rigid type for connecting different shaft diameters. Mentor 720.64 Brass Shaft Coupling - Inside Diameter 6mm One End 4mm The Other

Price: 5.75 from Rapid Online Rapid Electronics Ltd.