If you need real C-Clamps (cast iron as opposed to flat iron) look no further. These can support 150lbs each without bending like flat iron clamps or breaking like plastic composite clamps. The industry standard for over 50 years, if it ain't broke - don't fix it. Other styles available from 44lbs to 1100lbs support capability.
SAVE, SAVE, SAVE...20%...off Retail!!!
S&H from $6.99 in continental US (e-mail for international rates)