High Quality - Made of high quality spring steel, stable performance. High Precision - Fine workmanship, good elasticity, high precision. Protective Container - Each clamp is securely packaged in a separate protective container with label. Suitable for - For CNC milling lathe tool and engraving machine. Note - The collet must be placed in the collet nut before inserting it into the collet. Product Information Technical Product dimensions (L x W x H) 22 x 5 x 4 cm; 40 grams Finish Material Power Source type Quantity of items 1 Beak Height 1 Centimeters Included Components Included Batteries included? No Battery(ies) / Battery(ies) required No Weight 0.04 Kilograms Features: Material: 65Mn spring steel Model: ER20 Range: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm Height: 30mm OD: 20mm/0.78" End stroke tolerance: