Description: Internal thread M2.5, external thread M2.5, Diameter: 5mm Easy positioning, tight hold. Perfect for self repairers and watchmakers. Fits to Dial indicator, height gauge, depth gauge, etc. Interchangeable Tool. Stem extenders/extensions for repairing broken or extending watch crown stems. Specification: Material: White Steel Color: As Pictures Shown Total Length: 15 cm/5.91 inch Width: 4 mm/1.57 inch Package Includes: 1 Piece Dial Digital Indicator Extension Stem Rod