Hardened Stainless Steel Shaft :The shaft is made by hardened stainless steel for durability and smooth operation Pen Mandrel |Rotur Pen Mandrels Hardened Stainless Steel Shaft Ers Turning Tools - Pen Mandrel System And Precision Pen Eliminate Damaged Mandrels Bending Free: Perfect system to eliminate damaged mandrels and out-of-round pen blanks by putting pressure directly on the pen bushing, not the mandrel Auto Length Adapt:No need for extra spacer bushing as the system adapts to the length of your project No need for the knurled nut that sometimes gets lost, misplaced or stripped. Buy 1MT Turning Tools Woodworking Pen Mandrel Bundle with Mandrel Saver, Pen Making Kit at Auto Length Adapt:No need for extra spacer bushing as the system adapts to the length of your project.