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Precision Double Joint Universals - Aligns in two directions      

UD     Shaft holes are 3/16" dia. on both ends.
UD-2  Shaft holes are 1/8" dia. on both ends.
UD-3  Shaft hole is 3/16" dia. on one end and 1/8" dia. on the other end.

Now available in Metric to Metric and Metric to Inch sizes:

UD-4  Shaft holes are 4 mm dia. on both ends.
UD-5  Shaft holes are 4 mm dia. on one end and 1/8" dia. on the other end.
UD-6  Shaft holes are 4 mm dia. on one end and 3/16" dia. on the other end.
UD-7  Shaft holes are 3 mm dia. on both ends.
UD-8  Shaft holes are 3 mm dia. on one end and 4 mm dia. on the other end.
UD-9  Shaft holes are 3 mm dia. on one end and 1/8" dia. on the other end.
UD-10 
Shaft holes are 3 mm dia. on one end and 3/16" dia. on the other end.

Price:  $21.75 each