Table Leg Bracket for 1" aluminum tubing

I had left over 1" Diameter aluminum tubing and I needed to store items from a workbench above the worktop.  These brackets fasten to the underside of shelving material and the tubing slips into the bracket.  There is a hole for a fastener to lock the tubing in place but I haven't needed to do that.  Four of these  brackets are supporting a mechanics tool box with no problems.