As the marketing manager for a power tool company, I''m often asked about the difference between hammer drills and rotary hammers. Buyers want to know why there''s such a price difference between the two, and which tool is best suited for specific applications.I advise users to answer four questions before making the choice: What material will you usually be drilling? How large will the holes be? Will you be drilling an occasional hole or for extended periods? Finally, will you only be drilling, or would it also be useful to be able to use the tool in chipping, or hammer-only, mode?

Still, in the mid-1990s there were probably more than a half-dozen investment casters vying for the market, with additional firms looking to get in. Today, while nearly all U.S. manufacturers of high-end drivers are heavily involved in titanium, only two U.S. titanium castings producers of any prominence remain: Ruger Investment Castings of Prescott, Ariz., and Coastcast Inc., Rancho Dominquez, Calif. The most recent casualty was Cast Alloys Inc., which had offices in Carlsbad, Calif., and produced club heads in Tijuana, Calif. An executive of Advanced Cast Products in Neenah, Wis., Cast Alloy''s parent, confirmed industry reports that moth-balling the operation began late last year. He declined to discuss the reasons behind, the shutdown but acknowledged that the growing role of Asian casters was a factor.

The squarish wooden handles provide a good grip and the bits are hollow ground, just so.The set of three screwdrivers could be called small, medium and large, but more importantly, they are dead-on fits for each Colt size screw. The large size fits only the big hammer screw on the left side. The middle size fits the other two, as well as the one on the bottom of the frame. In my experience, that one needs snugging up now and then.The small one is the best of all. It fits the most easily buggered little screws on the backstrap and the three that hold the trigger guard to the receiver. All of those need checking occasionally and if you work on the innards of the old Colt, the C&S screwdrivers are mandatory.

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