Troika's Original Construction Pen sets the quality standard for multi-tool pens. This nicely weighted ballpoint pen has six sides, which ensures a very comfortable grip when writing. The Troika construction Ballpoint with a black finish features an architectural ruler in both centimeter and inches printed on the barrel and a level inside the barrel. Underneath its matching color stylus you will find a mini screwdriver with both flat-head and Phillips head. Surgical grip ensures easy twist action and precision when writing. Spare parts and refills available. Troika's Construction Pen is available more than 17 different finishes. Takes D1 Refill Personalize Troika Construction Pen with Logo Engraving MAX ENGRAVING SURFACE SIZE: 1.77 x 0.16 inches Engrave the owner's name, a special message, or promote your business with customized Troika Construction Pens. Click here for more information on item customization and personalization.