Features Made of high quality spring steel, they are stable in performance Fine workmanship, good elasticity, high precision The collet should be placed in the collet chuck nut before inserting it into the collet chuck Each clip is well packed in a separate protective container with label For CNC Milling Lathe Tool and Work Holding Engraving Machine Specification: Material: spring steel 65Mn Model No.: ER11 Range: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5mm, 6.5mm, 6mm, 6mm, 7mm, 1/1/1/1/1/1/1/1/1/1/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/2/8 inches, 1 4" Height: 18mm/0.7" Outer Diameter: 10mm/0.39" False round tolerance: <0.02mm Weight: 128g (approx.) The package includes: 1 set (15 pieces) x clamps Note: 1. Please allow 1-2mm error due to manual measurement. Thank you for your understanding. 2. The monitors are not calibrated in the same way, the color of the item shown in the photos may be slightly different from the actual item. Please take the real one as standard. Package List