Features: brand new high quality.Made of high quality material, durable Standard M2.5 rollers with non return nuts for indicators, made of high quality stainless steel to provide high performance. Smooth and adjust to the correct orientation to match the dial gauge reading.Solve wheel problems accurately and without detectable changes through efficient continuous testing. Prevent the probe from scratching the rim and the continuity of the dial indicator. Universal for most electronic/digital indicators and dial gauges and for measurements on slow moving materials. Product parameters: Roller diameter: 10mm Thread size: M2.5 Material: Stainless steel colour: silver Package Contents: 1 x Roller probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.