Center and Edge Finder: The edge detection tool accurately locates the starting point for all types of machine work and jig boring Measuring Capabilities: This edge finder has a diameter of 0.500" and can be used as both center finder and edge finder Accurate Measurements: The edge tool has an accuracy of 0.0002", making it a useful tool to have for many applications Durable Construction: Edge and center finders are hardened and grounded for a long life Set Includes: A Fowler edge and center finder with a fitted vinyl case