The plastic spare head I tried for an industrial hand tool left me unimpressed. As a result of my tests, I determined that this product was not up to par. While the weight may make it appealing for some industries its overall construction was too flimsy for my liking... The head felt as though it would easily break or warp with continued use. It's clear that this product was not built to withstand intense and prolonged use in the industrial and scientific fields..