3706 Jorgensen 6" bar clamp & the Harbor Freight look alike which also works great. But like all Harbor Freight items you should hold it in your hand & examine it before purchase. I very seldom buy Harbor Freight accept at a local store.
With this style bar clamp the Harbor Freight knock off has the problem of the fixed end not being square to the bar. Many-times it is twisted just a little. I was taking them out of the box to look at them & the sales lady came up & asked what I was doing so I showed her & she was amazed at how many were not square. But the few minutes of looking allowed me to buy at least 2 for 1 of the Jorgy's & they work just as well. I have about a dozen in the 6" size a few 18" & 24".
I also like the light duty aluminum tube style bar clamps & 3/4" pipe clamps did I really say that? I do have several Irwin quick grip clamps too, as well as wooden hand screw clamps.
"Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
"If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart