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. Product Notes: Please allow a little manual errors.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 confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 24 hours.