I've always wondered about what Silver & Demming means.

Does S&D mean anything other than the fact that they always seem to be 1/2" and larger and have a reduced 1/2" shank? If there is nothing else special about them, why would they not just be called reduced shank bits?

Does anybody know the answer? Google searches just seem to come up with hundreds of sets of bits for sale.

Does S&D mean anything other than the fact that they always seem to be 1/2" and larger and have a reduced 1/2" shank? If there is nothing else special about them, why would they not just be called reduced shank bits?

Does anybody know the answer? Google searches just seem to come up with hundreds of sets of bits for sale.

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