content: I looked at these and the other 4" hose clamps Amazon is selling and couldn't tell a difference other than a huge one in the price, so I ordered 50 of these for a new dust collection system. They came quickly and work fine. Several out of the 50 had some problems, mostly missing the small washer at the screw end, which is easy to find a replacement for.I don't see how Jet can charge almost almost $5 for one of these clamps when Grizzly charges $5.90 for 10. Even with the shipping you come out way ahead. If you compare the pics close they look exactally the same. Save your money and buy the Grizzly.