Chrome Plated 12" Inch Long 25mm Outer Diameter and Approximately 15mm inner Diameter Hollow Shaft 12" Long 25mm Outer Diameter Approximately 15mm Inner Diameter Chrome Plated Shaft 12" inch long 25mm Outer Diameter and Approximately 15mm Inner Diameter(15mm x 25mm x 12")Diameter Hollow Shaft (Chrome plated), This Shaft will make a great CNC, Router or any application needs precision linear movement.