Specification- Material- Metal and wood Color- Random Size-13.2 x 1cm/5.2 x 0.39"(L x Dia) Weight-40g Good quality, ultra-practical, pen smooth, feel comfortable. Effectively increasing the length and usage of the pencil. When your pencil is too short for painting in the drawing process, it is more convenient to add an extender.The Pencil Lengthener can be used for both round and hexagonal pencils. Sliding ring on nickel plated ferrule holds pencil securely. When your pencil becomes too short to hold, just insert it into this handy tool and carry on using it The metal handle is the same diameter and hexagon shape as most pencils, so it has the same feel as a full length pencil. Adjustable, works with most standard sized art, craft, hobby and school pencils double head ,one head is approx. 8.35mm,the other head is approx. 10.53mm,due to a derivation of the measurement ,if you feel lose ,you can wrap with tape or other materials.