Sure-Shade Universal Drive Tension Device Universal design compatible
with continuous cord loops and bead chain loops, even works with chain
Complies with 2010 ANSI shade safety standards. Must be
installed correctly or renders shade partially inoperable. Required on
shades, traversing panels, any window treatment with a drive cord or
chain loop. Independently tested and approved. Includes inside and
outside mount bracket, instructions and necessary screws. Patent
pending. Sold by the piece.