Rarity level 8/10❗️Authentic LEGO Bionicle exclusive White metal Krana Kal promo piece, also called WMKK. They're almost impossible to find these days and only 5000 have been produced + around 100 spares! :
LEGO Bionicle Bohrok Pahrak Set 8560 Complete No Instructions - Etsy
LEGO Bionicle Complete Set of Eight (8) Krana for Bohrok Lehvak Va - Dark Grey 673419012720 | eBay