Instruct: Classify the given review as either positive or negative.
Query: Good clamp

Good clamp. Good: Faces stay square. Heavy bar which won't deflect. Fast and easy to tighten. Square backs allow them to stay straight up on a bench. Bad: Clamps are heavier than you might think which can make them cumbersome... especially if you want to clamp a 12" board with a 50" clamp. the face of the clamp only tightens about 1-1/4" before you hit the end of the screw. This is about one half as much screw length as a pipe clamp.Overall: a wonderful clamp. much nicer to use than conventional bar or pipe clamps, but get some smaller sizes.