The flex-coupling allows 10 mm glass stirring rods to be used with a motor drive
The coupling uses a 3" long epoxy-coated spring to compensate for misalignment, reduces the chance of breakage and eliminates the need for special adapters
The glass shaft is secured by means of a silicone rubber insert
The top bushing will accept a 5/16" OD motor rod and is tightened by means of an Allen screw