Festool 489571 Screw Clamps 11-13/16" - Heavy Duty Woodworking Clamps for Carpentry, DIY Projects & Furniture Making

There really are TWO clamps in the package (not just one as implied in product details), and work as well as the shorter, original Festool screw clamps. Besides vastly superior material thickness holding capacity, there is another advantage: the improved insertion angle means these clamps could work in thicker bench tops. Festool's MFT is 3/4" thick MDF, with 20mm holes, but other capacities work. After some experimentation, and as a guideline only, some combinations and their results are shown below.3/4" bench top thickness:Short Festool screw clamp (489570), 3/4" hole - fitsLong Festool screw clamp (489571), 3/4" hole - fits24mm bench top thickness:Short Festool screw clamp (489570), 3/4" hole - does not fitShort Festool screw clamp (489570), 20mm hole - fits, but TIGHTLong Festool screw clamp (489571), 3/4" hole - does not fit/fits but EXTREMELY TIGHTLong Festool screw clamp (489571), 20mm hole - fitsI did use a drill press to insure the holes were true. I was able to force the long clamp through the 3/4" hole in the 24mm top, but it was very tight. I suspect that as the holes get used and worn in a bit, this could be an option. Hopefully this info helps you make a choice on which clamps to choose.Updated info Jul 30 2015 - Before purchasing these Festool clamps, I contacted Bessey to inquire about a possible solution from them. Bessey does have a new product line that they claim will work with the Festool MFT tables. I have no pricing information, nor any retailer info as these appear to be brand new. Their inside contact provided a brochure (I'll insert a pic of the product card). Contact [email protected] BESSEY Tools North America.A quick FYI: I do not own the Bessey product, but these do appear to be an alternative to the Festool clamps. Hopefully, Bessey will offer competitive pricing.