This is a handmade twist action ball point pen made by Placid Crafts. Yes, this pen is made from a Solid Steel Rebar Rod. The Hardware on these pens is Gun Metal. The pen is 5-1/2" long. I would consider this a standard diameter pen because the pen body is 1/2" Rebar and the knurled grip is .393. The raw REBAR pen body is very unique and not like the standard pen blanks that you buy. This pen body has no lacquer, sealer, or acrylic covering. This is a twist action pen that twists at the top and uses the Parker style ink refill. This pen comes with a Fisher Space Pen SPR Series Pressurized Black Ink/ Medium Point ink Cartridge installed.This refill was developed for NASA and has been used on EVERY Space Shuttle mission both American and Russian. They are hermetically sealed with a specially formulated thixotropic ink and pressurized to about 35 PSI. They are the only refills that will write at any angle because they do not rely on gravity, and have a shelf life of 100 years. / Pen #076