ʻO ke awāwa hoʻoheheʻe ʻo Curb he pōhaku ʻāʻī me ke kahawai wai i kau ʻia ma ka ʻaoʻao o ke alanui, no laila ua kapa ʻia ʻo ia ka ʻauwai kahawai. Hiki ke hoʻohana ʻia ke awāwa Curb i nā kahua paʻa paʻa a pau e pono ai ka mālama ʻana i ka wai, e like me ke kahua kaʻa, ke kahua kaʻa kaʻa a me nā wahi e neʻe mālie ana no nā kaʻa. Hiki i ka pae haʻahaʻa o ka ʻōnaehana ke hiki i D400.
ʻO ke kiʻekiʻe kiʻekiʻe o ka ʻōnaehana kahawai curb: 305mm, 500mm.