N-Scale plastic guard rail set includes a seamless flexible plastic tailing with posts and safety reflectors. Simply drill small pilot hole for posts. Insert with glue and clip on railing. Place 32 reflectors where needed. N Scale guard rail measures approximately 27-1/4" long and approximately 5mm (3/16" high) (Comprised of four 2" pieces and four 4-1/2" to 5" long pieces).