Southwire™ 07200 Replacement Metal Guard for Work Light Strings, Black, 125-Volt. Easy to open wing nuts secure lamp guard. Use with Southwire™ light strings, fits most standard light strings . Use for indoor/outdoor lighting systems. Accommodates Large bulbs - up to A23 (most household bulbs are smaller A19). Bottom open-ended bulb cage makes light bulb changes more convenient. Suitable bulb guard replacements for the Southwire™ Light strings (Model #s 07145 & 07538). Molded lamp holders are durable for a long life.