It had around 50 grams of TNT inside of it and an effective blast radius of 20 to 30 meters. The grenade was based on the French F1. The grenade is armed by the pulling of the safety pin and the release of the lever. Once the lever is released, the firing pin within the grenade can fall down and strike the primer which activates the delay which lasts for about four seconds. Used in the grenade is the UZRG type fuse which is commonplace for many different types of Soviet grenades. The total weight of the F1 system was about 600 grams and the total length was about 13 cm.