Using the WoodRiver Pen Blank Centering and Drilling Vise - YouTube
Packard Woodworks: The Woodturner's Source: Drilling Center Vise for Pen Blanks
Amazon.com: Taytools 469003 Deluxe Pen Blank Centering Drill Press Vise, Jaws open to 2-3/8 Inches, Will Drill Center of Blanks Up to 1-7/8 Inch Square : Tools & Home Improvement
Pen Centering Vise Jig for Drilling Center Holes in Pen Blanks on a Drill Press | eBay
Pen Press & Pen Blank Drilling Center Combo | ExoticBlanks