1、[Standard Size] With its standard 8mm rod diameter and 4mm hole, our dial test indicator centering holder can be easily connected with dial indicator, making it convenient to use. 2、[Arc Shape] The arc shaped dial indicator holder is ideal for special scenarios to locate the center of shafts or holes on machine tools with ease and accuracy. 3、[Premium Material] The dial indicator arc holder is made from steel, assuring a sturdy construction that is not easy to deform, ensuring a reliable performance. 4、[Advanced Protection] The centering indicator holder has undergone black treatment for rust resistance, which helps prolong its service life. 5、[Versatile Holder] Our dial test indicator holder serves as a multifunctional stand that is suitable for equipping test indicators with valve stems or dovetails, making your dial indicator operation more efficient.