1、The whole body of product is made of tungsten steel, high hardness, long service life. 2、Easy to install, just connect with dial gauge. 3、The product is suitable for dovetail rails dial gauge (please pay attention to the size you need when buying). 4、Fine workmanship, stable performance when you use it. 5、Fully satisfy the requirement of dial gauge for measuring accuracy. Feature: The whole body of product is made of tungsten steel, high hardness, long service life. Easy to install, just connect with dial gauge. The product is suitable for dovetail rails dial gauge (please pay attention to the size you need when buying). Fine workmanship, stable performance when you use it. Fully satisfy the requirement of dial gauge for measuring accuracy. Specification: Main material: Tungsten steel Type: (Optional) #1, M 1.6*L 14.7*D 0.5 tungsten steel #2, M 1.6*L 14.7*D 1.0 Tungsten Steel #3, M 1.6*L 14.7*D 1.0 Ruby #4, M 1.6*L 20.9*D 1.0 Tungsten Steel #5, M 1.6*L 20.9*D 1.0 Ruby #6, M 1.6*L 14.7*D 2.0 Tungsten Steel Package list: 1 * Indicator Needle Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.