... /8" Nickel Plated nut size: M6*25 mm. be used in pipe and joint system products; pipe diameter is: 28.00mm ... ; joint thickness is: 2.5mm.Nuts can be used widely in many fields.Automotive industry, electronic industry, semi-conductor industry, super ... , DIY stores, garden, school, hospital, pipe rack metal joint system, in facts, almost everywhere. T-type socket spanner