This Lock covers the hinged area of bi-fold doors to prevent them from opening. Special insert lets you adjust for all popular door sizes. Includes easy-grip wand for shorter adults. Made from clear, unbreakable polycarbonate. Product Highlights and Improvements ¥ Molded polycarbonate for superior strength and fit. ¥ Easy grip Wand enables shorter adult to operate. ¥ Designed specifically for childproofing professionals-not available in discount stores. ¥ Attractive, clear design.