The Dango Executive Pen has a threaded area at the top end of it so that you can mount it to the cap or make the pen longer

25 especially

1cm diameter pen

continues to perfect the style and functionalities of our classic Commander backpack

by attaching the BACKPACK HARNESS KIT (sold separately)

A10 Chassis Clip _tab2_pioneer-front-bag-features The Dango Executive Pen hasA10 Chassis Clip The stainless steel money clip snuggly attaches onto the A10 wallet chassis and secured with one screw. The clip can be used to hold cash, clip to a strap, attach to a belt or clip to a pocket. Compatible with all A Series wallets. Includes: #1 72 x 1 8 stainless steel screw 0. 50" hex wrench tool. A10 Chassis Clip