1Package Content: You will receive 1pc morse taper connecting shaft, 1pc ER wrench , 9pcs ER25 spring collet, meet your needs. 2Reliable Quality: Made of quality carbon steel, high strength, good toughness, strong impact resistance, stable performance, dsrable. 3High Safety: The extension rod is directly connected to the machine tool and tool, allowing you to work better, safer, and more efficiently. 4High 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. 5Easy 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. Item Type: ER25 Spring Clamps Connecting Shaft Material: Carbon Steel Collet Chuck Material: Carbon Steel Collet Chuck Model: ER25-3, ER25-4, ER25-5, ER25-6, ER25-8, ER25-10, ER25-12, ER25-14, ER25-16 Wrench Size: Approx. 5x30x190mm / 0.20x1.18x7.48in 1 x MTB3-ER25-M12 Extension Rod 1 x ER25-3 Collet 1 x ER25-4 Collet 1 x ER25-5 Collet 1 x ER25-6 Collet 1 x ER25-8 Collet 1 x ER25-10 Collet 1 x ER25-12 Collet 1 x ER25-14 Collet 1 x ER25-16 Collet 1 x ER Wrench 1. Make sure that the size of the collet and the extension rod must be the same.2. Due to manual measurement, please allow a difference of 1& 8209;3 mm.3. When the tool is inserted into the inner hole of the collet, it must exceed the effective holding length of the inner hole to avoid improper damage.