Legacy Woodturning, Slimline Pen Kit, Many Finishes, Single Kit Finish: Satin Nickel Type: Ballpoint Twist Pen Drill Sizes used: 7mm; Compatible Tube Sizes: 7mm; Skill Level: Very Easy Blank Size: 9/16 x 2-1/32; Refill Type: Cross Style Slimline Bushings will fit this kit; Bushings and blanks sold separately