This is a tee connection for Stem System components. A Connecting Stem is placed
horizontally in the Stem Connector and clamped down by two bolts (5/32 inch Allen Key).
The SC90(ext) will fit onto internally threaded Stem System components. The SC90(int) will
fit onto externally threaded Stem System components. Allows for clamping Connecting Stem at
a 90 degree angle to the external or internal threads (and the Stem System component
connected to those threads).