The present invention provides compounds of Formula (I), and pharmaceutically compositions thereof. Compounds of Formula (I) are binders of bromodomains and/or bromodomain-containing proteins (e.g., bromo and extra terminal (BET) proteins). Also provided are methods, uses, and kits using the compounds and pharmaceutical compositions for inhibiting the activity (e.g., increased activity) of bromodomains and/or bromodomain containing proteins and for treating and/or preventing in a subject diseases associated with bromodomains or bromodomain-containing proteins (e.g., proliferative diseases, cardiovascular diseases, viral infections, fibrotic diseases, metabolic diseases, endocrine diseases, and radiation poisoning). The compounds, pharmaceutical compositions, and kits are also useful for male contraception.