Contact point for use with most series dial test indicators. Made of tungsten steel it has high hardness wear resistance impact resistance and durability and has a long service life. Applicable to all kinds of dial indicators height gauges depth gauges thread M2.5 measuring tools etc interchangeable tools. Suitable for detecting the bottom of a groove or hole. Effective length is not include thread shank and knurling shank. Note: Please allow 0-1mm error due to manual measurement. Please confirm the needle point contact point Length and Diameter you are ordering.