The SRP Flexible Arms are made of 1/2" diameter1 Loc-line®, are 5.5" long when assembled and include a 1/4"-20 stainless (marine grade) screw interface on each end.  Two arms are included.

Note 1: Loc-line is specified by hole diameter.  The hole diameter of the Loc-line used in this product is 1/2".  Outside diameter is 1".