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Internal surfaces of a 3 mm diameter channel were finished to less than 4 μm Ra .
 concept or principle: surfaces; manufacturing process: mm; concept or principle: diameter; application: channel
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: surfaces, mm, diameter, channel 
Answer:
 concept or principle: surfaces; manufacturing process: mm; concept or principle: diameter; application: channel