awesome! been using since 1988. lost the original. alvin went out of business or discontinued. nice to be able to find online.

This is a handy tool for use during new designs. It helps with layouts and also helps with screw and thread pitch selections for my designs. Very handy! And well made too.

I design wooden and aluminum fixtures and jigs for building acoustic guitars in my workshop. I used this data selector when I used to design test fixtures for missiles from aluminum and magnesium. It is very useful for specifying the size of holes, bolts and layouts for wrench clearances.

I first saw one of these things back in the mid-70's (I think - anyway, a long time ago) either in school or at one of my first jobs. If you do machine design, they are a necessity - so many things are bolted together, and this little gizmo gives you the day to day info you need for bolted or riveted joints - the sizes of bolt heads, wrench clearance needed, allen wrench sizes, drill bit common sizes, stress area for strength calculations - all in a gizmo that never needs re-booting, never crashes, and doesn't take up much room on your desk. Spilled coffee and UV from sunlight will get them though! I'm on my 3rd one in my career.

I bought two as gifts for a couple young Engineers just starting their careers at the company.

I have had one for a long time. It is a convenient, quick reference for design engineering.

I was pleased to see the quality, price, and the fact that it is still available.