They're good and work reasonably well, but the fit between the piston and bushing is looser than the same type of clamps I bought from Xpaowa: https://www.amazon .com/ XRPAOWA -Toggle-Release-Holding-Capacity/dp/B07214XRR1 Smoothness wasn't that great either. There was less lubrication and it got stickier. This causes the piston to wobble a little and requires a little more force to extend and retract. It still works, it just doesn't feel as good. I thought it was the same part made by the same factory, but I think there are subtle differences. Another thing to note is that they have 5/16-18 threads, not 8mm on the Xrpaoa model. All this to say that it still works and still holds up well enough for my application.
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