Shelf Guides Numbered, 4" X 21", X-Ray Size, Yellow. Can Be Used On Left Or Right Hand Aisles. Use These Visual Indexes To Make Re-filing More Accurate With 24 Gauge, Bright Yellow Guides With Black Characters Printed On Both Sides. Allows Filing Areas to be Divided into in 100 Separate Filing Compartments by Terminal Digit. Packaged 100/Box