Use up to the last part of your pencils with these Derwent pencil extenders. The silver extender is larger and fits perfectly for lapoices up to 8mm including Dewent Pastel, Coloursoft and pencils for artists. The black extender fits in standard-size pencils (up to 7 mm), including Derwent Graphic watercolor, and Studio pencils, as well as any other brands' pens. Both feature a solid threaded union extenders to hold your pencils securely, and a soft touch coating on the barrel for a better grip. The set contains an extender of each size.