Legacy Woodturning, Sierra Pen Kit, Many Finishes, Single Kit Finish: Gold Tip, Clip, Cap / Black Chrome Body Type: Ballpoint Twist Pen Refill Type: Parker Style Ballpoint Pen; Skill Level: Very Easy Drill Size: 3/4" Pen Mill with 27/64" drill bit; Compatible Tube Sizes: 7mm; Blank Size: 1/2" x 2-1/32" Sierra Bushings will fit this pen kit; Bushings and blanks sold separately