What tangentially related industries might impact the power tool industry?

Without knowing the particulars of your question, I would have to say the electrical and electronic components, plastic and rubber industries could all have an impact on the manufacturing of power tools (i.e. changes in pricing, supply and demand, etc.). On the other end of the spectrum, changes in the real estate, building, construction and related industries could affect the sales of power tools should these markets experience a downturn or upswing.