Let’s look at one of my grail pens; I’ve included it in the series on my personal pens too.

Measurements
Length (capped): 156.0 mm/6.14″
Length (uncapped): 142.2 mm/5.60″
Length (posted): 186.4 mm/7.34”
Diameter (section): 11.2 – 12.8 mm/0.44″ – 0.51″
Diameter (barrel): 12.2 – 14.8 mm/0.48″ – 0.58″
Weight (all): 63 g
Weight (cap): 43 g
Weight (body): 20 g