Extension for internal micrometer screws 3-point L-150 x fi 23.4 mm M18. This extension is an addition to your internal micrometer screws and allows measurements in deeper bores. It features an M18 thread connection and is suitable for a measuring range of 30-50 mm. Compatible with series 312.1XX, 312.2XX, 312.26X and 312.27X. Technical data: Length x Diameter: 150 x 23.4 mm Thread: M18 Measuring range: 30-50 mm Condition: New Important features: - Extension for internal micrometer screws - M18 thread - 150mm length - 23.4mm diameter - For measuring ranges 30-50mm