Blast Grenade (5e Equipment)
From D&D Wiki
Also known as concussion grenades, these are anti-personnel devices with a low blast radius but a high casualty radius.
As an action, you can throw a blast grenade at a point up to 60 feet away. Each creature within 10 feet of an exploding blast grenade must make a DC 15 Dexterity saving throw or take 8d6 bludgeoning damage and be stunned until the end of its next turn. On a successful save, a creature takes half damage and isn't stunned.
Weight: ½ lb.