I've had 3 pairs of Jorgensen clamps for the last 30 years.  When I moved to Maui 2 years ago I didn't bring them with me.  I did without for a year but got a pair of the size 04's last month.  What a relief!  I've used them 6 or 7 times in the last month.  Indispensible especially for tapered or uneven surfaces. Holds things TIGHT to each other or another surface.