秤砣虽小压千斤 (秤砣雖小壓千斤) chèngtuó suī xiǎo yā qiān jīn

chèngtuó suī xiǎo yā qiān jīn phrase although small, a steelyard weight may tip a hundred pounds; apparently insignificant details can have a large impact
Domain: Proverb 谚语
Notes: (CC-CEDICT '秤砣雖小壓千斤')