The diameter of the best wire to measure the effective diameter of a metric screw threads of $$0.5$$ $$mm$$ pitch is ......... $$mm$$

The fit on a hole-shaft pair system is specified as $$H7$$-$$s6$$. The type of fit is

The most widely used reinforcement in modern day $$FRP$$ tennis racket is

A shaft of diameter $${20^{\matrix{ { + 0.05} \cr { - 0.15} \cr } }}$$ and a hole of diameter $${20^{\matrix{ { + 0.20} \cr { + 0.10} \cr } }}\,\,mm$$ when assembled would yield.