AK-47 Rifle Bullet Spiked Black Knuckle Paperweight. AK-47 brass knuckles in a black finish. Your enemies know you mean business when you are geared up hard core with these stylish Kalashnikov AK automatic assault rifle bullet spiked knuckles. Unique design with circular finger holes with bullet spiked, made of a lightweight durable zinc alloy, 4 3/8" long by 2 3/8" tall.