The 475A three star diamond tip scribe with aluminum handles and 20 mil fine straight tip. The overall length is 4.5.Specs amp; FeaturesDiamond Tipped, Aluminum Handles, Application: Diamond coated tips are very strong, Quality: , Surface Resistivity : Conductive, Shape: Straight, Material: Aluminum, OAL: 4.5 (112.5mm), Tip Width: .02 (.5mm), Tip Height: .020 (.5mm)