uxcell Alloy Schoolchild Art Writing Double Side Pencil Lengthener Extender Holder The metal handle is the same diameter and hexagon shape as most pencils, so it has the same feel as a full length pencil. Base Hole Diameter : 7.6mm/ 0.3" Overall Size : 13.5 x 1.2cm/ 5.3" x 0.47" (L*D) Top Hole Diameter:9mm/ 0.35" Adjustable, works with most standard sized art, craft, hobby and school pencils.