We engineered this swinging target for rifle use. Mounts on a standard T Post without tools Plate sizes 3, 4, 6, and 8 inch diameter round Plate thickness 1/4", 3/8" and 1/2" (1/4 and 1/2 available soon) Plates interchangeable without tools Front Armor AR 500 3/8" (no welds) VERY heavy duty...