Declension table of ?vajraka

Masculine	Singular	Dual	Plural
Nominative	vajrakaḥ	vajrakau	vajrakāḥ
Vocative	vajraka	vajrakau	vajrakāḥ
Accusative	vajrakam	vajrakau	vajrakān
Instrumental	vajrakeṇa	vajrakābhyām	vajrakaiḥ vajrakebhiḥ
Dative	vajrakāya	vajrakābhyām	vajrakebhyaḥ
Ablative	vajrakāt	vajrakābhyām	vajrakebhyaḥ
Genitive	vajrakasya	vajrakayoḥ	vajrakāṇām
Locative	vajrake	vajrakayoḥ	vajrakeṣu

Compound vajraka -

Adverb -vajrakam -vajrakāt