Derwent Pencil Extender Set, Silver and Black, For Pencils up to 8mm, 2 Pack (2300124) Derwent Pencil Extender Set lets you use almost every bit of a pencil before having to throw it away Silver extender fits larger-size pencils up to 8mm Black extender fits standard-size pencils up to 7mm Adjustable screw fitting holds pencils securely Soft touch coating on barrel offers a firm grip