Precision and hardend Titanium coating wear-resisting non-magnetic and the inside structure also has special material, it is non-magnetic Shank: 10mm (shank diameter tolerance H7 ) suitable speed: 400--600rpm Probe: 4mm and 10mm Biggest diameter of edge finder: 20mm Colour: gold Material: high-speed steel Package Contents: 1 x edge finder PLEASE 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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!