Given time and resources soldiers could add mines and anti-tank obstacles to make their positions nearly impregnable. These kits include both obstacles and minefields. The 15mm kit includes eight 8" x 2" sections of anti-tank obstacles and ten 8" x 2" minefields. The 10-12mm kit includes nine 6" x 1 1/2" sections of anti-tank obstacles and fourteen 6" x 1 1/2" sections of minefields. The 20mm kit includes eight 10" x 2 1/2" sections of anti-tank obstacles and ten 10" x 2 1/2" minefields. The 28mm kit includes eight 10" x 3" sections of anti-tank obstacles and ten 10" x 3" minefields.