Use when stubbing out with ½" flexible CTS tube;StrongArm brackets provide a very rigid installation;Plastic elbow swivels 360 Degree to work with tubing coming from any direction;PEX Bend LockBlocks are pre-assembled on each pair of brackets;Position stub outs at any desired location within the stud bay;Twisted brackets mount to face of stud, and L-bent brackets mount inside stud cavity;When screws on blocks are tightened, blocks compress on tube, brackets and elbow eliminating all movement