Feature:1. High Quality Materials: High quality steel material, durable, is the perfect choice for tightening tools.2. Avoid Damage: Watch threaded back cover opener reduce damage and user injury during maintenance and bring a good experience.3. Notch design: Collet closing tool with various notch designs, hairpins of various sizes can be tightened.4. Small Size: Bottom cover opener is light weight, easy to carry and store, and does not occupy much space and place.5. Labor Saving: Bottom cover opener is professional tools of watchmakers and watch repairers can save you expensive repair costs.Specification:Item Type: Watch Collet Tightening ToolMaterial: SteelProduct size: Approx. 55 x 22 x 20mm/2.1 x 0.9 x 0.8inPurpose: clamp seat, special clamp wheels, pointers, etc., clamp repair Package List:1 x Watch Collet Tightening Tool1 x Plastic BoxNote:Please allow error due to manual measurement. Thanks for your understanding.