Irwin Quickgrips 4-Inch Handi-Clamps
Irwin’s resin-body Handi-Clamps have a pliers-style hand grip that ratchet to lock closed; with a quick-release trigger to unlock the ratchet. The business end closes similar to standard C-Clamps, with a throat depth of 3 inches and a maximum 4-inch closure. The jaws end in 1-inch square rubber pads that can swivel to accommodate angled surfaces. Irwin also makes smaller sizes, whose jaws open to 1½ and 2 inches.
|The clamps are made of plastic instead of steel and they apply pressure through hand strength instead of with a screw, so they’re not intended for heavy use like a C-Clamp. They're an improvement on spring clamps though, because you can control the clamping pressure to some extent.|
Irwin says that this size Handi-Clamp provides maximum clamping pressure of 75 psi, which is sufficient for small jobs and holding items steady when positioning larger clamps. Their rubber-padded jaws are less likely to mar delicate surfaces, and the swiveling pads helps them fit irregular or oddly-shaped surfaces. Unlike the full 360-degree swivel you find on a C-Clamp’s moving arm, the Handi-Clamp pads only rotate in the plane of the jaws.