The green tint is interesting, and looks very nice on the black bachground. I find the highlight a little too much, its too big and therfore distracting from the subject. You shouldn't have cropped so close from the bottom that the screw is cut off. You should also try some more interesting perspectives than just straight down.
hmm,... i find the overexposed top part of the tool rather distracting. i think the cropping could have been improved, by including the lower screw, maybe a different image size could have been good, like a square... i think it could be allright in the end, but there are a number of problems to work through yet.