Elfun(TM) Odd Head Pencil Extender Holder Pencil Lengthener Art Writing Tool -Pack of 5 Can be used for both round and hexagonal pencils. Adjustable, works with most standard sized art, craft, hobby and school pencils. Diameter of the wood handle: approx. 8.5-8.9mm(pls allow a little deviation). Total length: 12cm /0.35 inch When your pencil becomes too short to hold, just insert it into this handy tool and same feel as a full length pencil.