This kit is a modern interpretation of the bolt action pen. It features a Bolt Action pen clip that acts to advance and retract the refill and works just like the original bolt action mechanism. In addition, there is a second way to advance and retract the refill by easily pushing the end of the popped-out bolt in and out. A precision-cut knurl finish on the tip and end provides an industrial look with a comfortable feel and writing experience. It has a Stainless-Steel clip for tough durability that won't break or show wear with daily use. This kit uses a 3/8 in tube and is easy to make. Includes a Parker-style refill.