A hand-held grenade can destroy a tank?
On impact, the RKG-3 detonates a shaped charge (demonstrated in yellow in this cutout) that fires a hypersonic slug of copper with enough force to penetrate more than 20 centimeters of armor.
Not normally. These grenades are specially designed to defeat armor by using a shaped charge that can penetrate a tanks armor and start a fire inside. These particular grenades were normally launched at a tank and designed to impact the tank with the grenade's long axis perpendicular to the armor.
It turns out that dropping them from above is an ideal way to attack the tanks since they have thinner armor on top, and gravity aligns the grenade vertically.
The fins keep them aligned as they fall when they are dropped from a drone.
Videos of these grenades in used show how effective they are. Small quadcopter drones at about 400 to 500 feet are hard to see and hard to hear so they can get right over their targets.