2 Camera Lens Air Dust Blower Cleaner SLR Hand Tools. This is a new set of 2 dust blowers. They are great for removing crystals from watches. Insert nozzle inside any watch stem hole and squeeze the bulb and it will blow out the crystal without damaging it. Just squeeze for a blast of air. You receive: One dust blower that measures approximately 5 1/2" (140 mm) long. One dust blower that measures approximately 4 1/2" (114 mm) long. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.