1521 Series 6mm ID Spacer (8mm OD, 12mm Length) - 4 Pack

This 12mm length, 8mm OD spacer is able to slip over an 6mm shaft—whether that’s a round shaft or a D-shaft—to create space between components. When you run it against a bearing, the spacer will only contact the bearing’s inner race. This allows your project to rotate smoothly.