Usage Tips:1、Package Content: You will receive 1pc morse taper connecting shaft, 1pc ER wrench , 9pcs ER25 spring collet, meet your needs. 2、Reliable Quality: Made of quality carbon steel, high strength, good toughness, strong impact resistance, stable performance, dsrable. 3、High Safety: The extension rod is directly connected to the machine tool and tool, allowing you to work better, safer, and more efficiently. 4、High Accuracy: The use of extension rods can provide complete depth and high precise parameters. If the tool is directly connected to the machine tool, the product data will vary greatly during the work process. 5、Easy To Operate: Help you eliminate the risks of pulling the handle from the collet, and extend the drill bit to provide a complete cutting depth and improve efficiency. 1 x MTB3-ER25-M12 Extension Rod1 x ER25-3 Collet1 x ER25-4 Collet1 x ER25-5 Collet1 x ER25-6 Collet1 x ER25-8 Collet1 x ER25-10 Collet1 x ER25-12 Collet1 x ER25-14 Collet1 x ER25-16 Collet1 x ER Wrench Item Type: ER25 Spring ClampsConnecting Shaft Material: Carbon SteelCollet Chuck Material: Carbon SteelCollet Chuck Model:ER25-3, ER25-4, ER25-5, ER25-6, ER25-8, ER25-10, ER25-12, ER25-14, ER25-16Wrench Size: Approx. 5x30x190mm / 0.20x 1.18x 7.48in