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I believe that with the new salt and pepper shakers, the salt shaker is the one with 3 holes, while the pepper goes in the one with 2 holes. Salt is used more than pepper anyway. Pepper should only ever be fresh ground at the table, meaning salt shakers win out.
Our 2.4mm system sits exactly between 2.0mm and 2.7mm. It includes a full range of DCPs from 4 to 12 holes and screws from 6mm to 40mm. The screwdriver is 1.5mm across the flats hexagonal the same as for 1.5mm & 2.0mm screws.