Review of Quick-Grip 59400CD 4-Inch Handi-Clamp

These clamps are very quick to apply and release but due to the lack of mechanical advantage, the distance from the pivot to the clamps is virtually the same as the distance from the pivot to the end of the handles, you cannot apply much more than hand pressure to the work. These may work fine for clamping the work while glue sets up or for stabilizing a router guide or some other task that does not require a lot of pressure but cannot compare to C-clamps or Vice grips in holding power. I bought 3 of these things for use in an industrial environment to clamp stops in a vertical boring machine but they would slip at the slightest impact, no matter how hard I tried to clamp them. As I pointed out, the problem seems to be the lack of mechanical advantage in clamping. The design simply will not allow you to hold any item tighter than you can hold it with your hand. In applications where you need another hand to hold something, they are probably just fine, and just that, another hand.

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Product Description:
Irwin 59400CD Handi-Clamp 4"Irwin 59400CD Handi-Clamp 4" Features:; Quick-Release " trigger allows for fast and easy positioning and release ; Patented ratcheting mechanism provides adjustable clamping pressure and significantly reduces hand force required to generate clamping pressure; High-tech resin construction provides strength and durability ; Specially designed jaws hold odd-shaped work pieces ; 4" clamping and spreading capacity, 3" throat depth

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