This Cricut adapter fits standard sharpies, gel pens, pencils, and and just about any writing utensil. SHIPS FREE!! The screw adjusts to hold most size pens in place. These are designed and 3D printed by me, which makes the fit perfect for the Cricut Maker, Explore Air 2, and Explore Air. Stop spending tons of money on Cricut branded pens and markers, and get this one-size fits all adapter! It'll also alleviate the hassle of having to keep track of 20 different plastic adapters and finding the right size each time you change pens.