Sioux Chief Square O Strap™ Solder Strap™ Tube Strap, Series: 505, 1/2 in CTS, 2.125 in H x 2.125 in W x 0.22 in D, Domestic
1/8 in mounting holes align with most conventional brackets17 ga copper plated steelSpot solder to copper tube (heat the tube, not the strap)