Model: ER11. Grip Range: 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm. High clamping force, wide clamping range, high precision. Output tolerance: 0.003mm. Made of high quality specially formulated spring steel, first class 1065 carbon steel. Widely used in drilling, cnc milling tool, threading, grinding, engraving machine. Correct clamp mounting methods: 1. Put the chuck into the presser cap, gently rotate the collet spring when the eccentric part of the collet spring groove recessed in the presser cap. In the direction of the arrow and using the same force to push the clamp spring, you can mount the pressure cap. 2. Place the collet spring and cap together on the chuck or spindle body. Insert into the clamping hole after wiping the cylindrical rod, use a wrench to tighten the pressure cap, until the tool is tight before use. Note: Avoid securing the presser cap with an uninstalled tool to prevent damage to the clamp spring. 3. Using a wrench, loosen the pressure cap and remove the chuck or tool, then remove the tool. In the direction of the arrow, push back the clip spring, then, if necessary, replace the other clip spring. Specifications: Model: ER11 Material: First Class 1065 Carbon Steel Clamping range: 1.5mm to 7mm ( 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm) For metric shank sizes: For example, 1mm collet fits metric shank, 2mm collet fits 2mm metric shank Package includes: 1set(12pcs)