The QB4-11A Pencil Eraser Installer is a special device for installing aluminum hoops and erasers on one end of round or hexagonal pencils. If you need produce the other shapes of pencils, just change corresponding inner parts of its hopper, transmitting screws, steel mouth of stitch parts and so on. We adopt high-class resin sand to make all castings of the machinery, which are stable and indeformable forever after annealing and ageing treatment. All materials for main parts of body are made of quality carbon steel to ensure stable running. The vibrating salver is made of stainless steel 304, which not only keeps eraser installer clean but also prolong lifespan of vibrating salver effectively.