1. Made of high quality spring steel, their performance is stable 2. Fine workmanship, good elasticity, high precision 3. The collet should be placed in the collet nut before inserting it into the collet clamping 4. Each clamp is well packed in a separate protective container with label 5. For CNC milling tool and engraving machine work holding Specification: Description: These spring clamps are made of high quality 65Mn spring steel for CNC milling tool and work holding engraving machine. There are total 6 clips of different sizes on the board which can meet your needs. Each pliers is well packed in a separate protective container with label so you can easily distinguish them. The collet must be placed in the collet nut before inserting it into the collet. Features: Made of high quality spring steel, their performance is stable. Fine workmanship, good elasticity, high precision. The collet must be placed in the collet nut before inserting it into the collet. Each clamp is well packaged in a separate protective container with label. For CNC milling tool and work holding engraving machine. Specifications: Material: 65Mn spring steel Model: ER32 Range: 10mm, 12mm, 14mm, 16mm, 18mm, 20mm Height: 40mm / 1.57" Outer diameter: 31mm / 1.22" Runout tolerance: Weight: 753g(Approx.) Package Includes: 1 Set(6pcs) x Tweezers Note: 1. Please allow 1-2mm error due to manual measurement. Thank you for understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.