The BLACK+DECKER® 36in accu-mark gecko grip level, BDSL10 helps you to hang shelves, pictures and other items. Just position it and use the easy-to-read bubbles to determine level, then mark it with a pencil so you know where to set the items. This picture hanging level tool has a gecko grip design that keeps it in place without sliding. The soft exterior leaves No marks on walls so you can use it on finished surfaces. At 36in long, it's compact enough for easy transport yet long enough for accurate readings. You can use it with just one hand for faster and easy results. This unit is lightweight for easy use but strong enough to handle impacts and drops for a long operational life.