The F-1 fragmentation hand grenade (GRAU index — 57-G-721) is a remote-action hand grenade designed to destroy the enemy's manpower in a defensive battle. You can throw a grenade from different positions and only from behind cover, from an armored personnel carrier or a tank. Since the F-1 is a defensive grenade, the radius of damage by fragments significantly exceeds the radius of a possible grenade throw.

https://en.wikipedia.org/wiki/Grenade