Hawaiian Spring Rollerball & Fountain Pen Kit - This kit reminds me of the Spring Blossom kit that used to be available, it even fits the same bushings if you happen to have them laying around.
Specs-
5.62 inches long closed (142mm)
2.5 oz (approximate)
Drill needed, 11/32" and 37/64"
Brad point Drill Bit / Twist Drill Bit
Single Kit Includes-
-Pen Kit
-Tube
-Rollerball Style Ink Refill or Fountain Cartridge Refill