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If you are referring to the small retaining screws for the disk they are an interior Torx head. Most Torx sets have the size you are looking. Torx sockets aren't measured in mm but by a different system and comes in sizes such as - T-30,T-40,T45,T-47,T-50,T-60,T-70, and so on.
Have a look at the link below for a sample
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Honda Civic 1.4l