Features Good material: high quality carbon steel material with good hardness, also very durable for oxidation and long use. SECURE MOUNTING - Can be mounted on a lathe or as a jig on a grinder plate for use, very safe and reliable. Perfect Match: allows wide use on CNC milling machines, rotary tools, engraving machines and other devices. Standard size: with a diameter of 80 mm, this collet for milling machines promises a high accuracy of 0.005 for stability. EASY TO INSTALL - Designed to be lightweight and compact in size, installation is simple. Specification: Item Type:Collet Model: ER32-D80 7 holes Diameter: approx. 80 mm / 3.15 inches. Accuracy: 0.005. Material: carbon steel Package list: 1 x collet Small note: Before inserting the collet, the collet must be mounted into the collet nut. Package List 1 x Collet