Mr. Pen 12 inch compass with wing Pencil holder for use as a compass Lockable wing for repeat measurements Marking diameter:1/2" to 30" Leg length: 12" Easy to use Professional All Metal Compass/Divider For Woodwork, Carpentry, Metal Work, Leather Work, Math, Etc. The Compass Legs Measure Up To 26 Inch And Can Draw Circles With Radius Of Maximum Around 30 Inch (76 cm) Designed With A Pencil Holder To Easily Change The Pencil For Sharpening Purposes (Pencil Is Not Included) Can Be Used As A Scribe Or Divider To Quickly Measure lengths And Copy Measurements Lockable Sliding Nut Design Allows For Quick Leg Adjustment And Repeatable Measurements