Introducing the 5/16 in. to 18 in. Cam Clamps (4-Pack) by POWERTEC. These high quality, ultra-useful clamps allow for the fast, easy clamping and release of work stock, hold-down fences, accessories -and more - in your jigs and fixtures. Featuring a longer slot in the clamp body, this updated clamp design successfully expands its clamping range. Save time and hassle and increase project possibilities with these efficient clamps. Easy Installation:- Ideal for use in your t-track assemblies, these clamps can be used with 5/16 in. to 18 in. threaded hex-bolts, t-bolts, and threaded knobs. We've included the four 3 in. L, 5/16 in. to 18 in., four 5/16 in. to 18 in. threaded inserts (plated and removable), 4 rubber washers (protect the clamping surface and aid in compression) and four steel washers to ensure easy installation and use. Efficient and effective Usability:- Our cam clamps allow for the quick clamping and unclamping of work stock in your jigs and fixtures. A secure cam-activated lock ensures both a quick lock and smooth release for a streamlined workflow in your drill-press and router applications. Tightening knobs in tight areas can be difficult, but the cam-action of the lever makes clamping, even in hard to reach areas, a cinch. To Sum It up:- Increase the utility and versatility of your bench-top operations with these handy clamps. Get the value-added advantage with the handy 4-pack.