[Model] 900M-TI Outer diameter: approx. 6.5mmInner diameter: approx. 4.0mm Length: approx. 42cm [Good Quality Material] It indicates high heat with high heat which is fast and 480 heat resistant for durable use. Yes, with proper use of the iron tip, its service life can reach more than 20,000 solder joints. [Features] This tip has the advantage of long service life and not easy to rust, easy to install and use. [Applicable] This tip is applicable to soldering station 936, 937 and so on with its needle-shaped pointed end which suitable for DIY, for example, it is attached to the alarm control as yes, the micro switch would have detached from the small circuit board, and the contacts of the micro switch are smaller than the micros.