The RKZ10BKV#P1 is a 10 V Zener diode rated at 0.7 W continuous power dissipation. In a shunt regulator or voltage-clamp circuit, the 10 V breakdown sets the regulation point; the 0.7 W ceiling limits the current the diode can sink before the junction overheats.
Bulk packaging — what it tells you
Bulk is common for surplus lots or low-volume production runs. For automated pick-and-place, verify the part orientation and handling requirements; bulk parts may need manual loading into feeders or a tray.