This is a Self Healing Work Top Mat Designed to Preserve the Work Surface, and save money . . . fewer Broken Knife Blades. FEATURES: Many Handy Markings Printed On The Surface, Including: Vertical Rulers, Metric and Standard Horizontal Rulers, Metric and Standard 2" and 3" Star Templates 30°, 45°, and 60° Angles 1" Graph Background Dowel and Wood Stick Size Chart, Ranging from 1/16 to 5/8" Airplane Spec Conversion Chart (Standard to Metric), Including Wing Area, Wingspan, Weight, Wing Loading, Fuselage Length, Engine Sizes, Bolt, Screw, Drill and Tap Size Information Table. INCLUDES: One 18" x 24" Builder's Cutting Mat SPECS: Width: 18" Length: 24"