Check out reviews on the JackClamp:
A Pro Tool Innovation Award Winner
"This is the best bar clamp that we've ever tested."
A Concord Carpenter
"... JackClamps can almost always be adjusted or modified to accomplish the task at hand and get the job done, and for that reason they have earned a permanent place in my truck."
Pro Tool Reviews
"... I had it hoist an over-the-stove microwave I was installing—a superb example of how perfect a tool like this can turn a two-man job into a one-man job."
One Project Closer
" The JackClamp is set apart because it features two parallel metal bars. Both parallel bars are easily adjustable, reversible and removable to tackle any project."
"As a bar clamp, it has a 13″ deep throat for clamping around obstructions. Flipping the handle around the extra bar gives the JackClamp a 33″ spreading span."
" It excels in small clamping applications, particularly when a large c-clamp is needed or when the handle on a traditional one-handed clamp cannot fit into the work area."