STAUFF 112A-PP Polypropylene Clamp Body to suit 12 to 12.7mm 1/2" diameter tubes.  These are ideal as Yagi Antenna insulators when using 12.7mm 1/2" diameter aluminium tube.   These clamps when tightened to an aluminium boom using two M6 Hex screws and rivet nuts are extremely strong.

12.7x1.45mm 1/2" diameter aluminium tube part# UA1230 is available as stock item in most Australian cities from Ullrich Aluminium

Use the HS-M6x30-SS Hex Socket screws and N-M6-RIVET-SS Rivet Nuts with these clamps for mounting to a square aluminium boom.

We can generally supply these in higher quantities than stocked in around 1 week POA