you get 1 hexadecimal thumbwheel switch they are RS Components 337-093 and I believe them to be the same as Apem SMFB16N1248. The size is 45mm deep x 33mm tall x 10mm (widest points)  or 8mm (the width of each switch when stacked together ). It has positions 0-9 & A-F. 

shelf cl-8e5

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