Feature:1. Application: This is a chuck, whch is widely suitable for S40A, for S40‑360, for S40‑580, etc. pneumatic grinders2. 3 Jaws: This chuck has 3 jaws, which can provide better contact and stronger grip, you can use with confidence3. 45# Steel: The chuck is made of 45# steel material, and the surface is blackening to prevent corrosion and rust4. Longer Service Life: This chuck is stronger, has a longer service life, and has good flexibility, practical5. High Clamping Force: Chuck has high clamping force, good holding stability, wear resistance, stable performanceSpecification:Item Type: Pneumatic Grinder ColletMaterial: 45# SteelPurpose: Pneumatic Tool AccessoriesSurface Treatment: Blackening TreatmentColour: BlackModel: S40AApplicable Pneumatic Grinder Models: For S40A, for S40-360, for S40-580 Package List:1 x Chuck