Precision and hardendTitanium coating wear-resisting non-magnetic and the inside structure also has special material, it is non-magneticShank: 10mm (shank diameter tolerance H7 ) suitable speed: 400--600rpmProbe: 4mm and 10mmBiggest diameter of edge finder: 20mmColour: goldMaterial: high-speed steelPackage Contents:1 x edge finderPLEASE NOTICE--This edge finder is special, the biggest diameter is 20mm, it is bigger than the normal ones, so the edge finder is more steady and high precision.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.