Features 
Extensions are designed to be used when measuring very deep features and bores or when probing points with limited access.
Ceramic stems offer stiffness comparable to steel but are significantly lighter than tungsten carbide.Ceramic stemmed styli can also offer additional crash protection to your probe as the stem will shatter in a collision.
M4 Thread ,Diameter 7.4mm(0.2913"), Effective length 50mm(1.9685")  Ceramic Extension Stem.
Package: 1*Ceramic Stem