Features 1、Application: This is a chuck, whch is widely suitable for S40A, for S40‑360, for S40‑580, etc. pneumatic grinders 2、3 Jaws: This chuck has 3 jaws, which can provide better contact and stronger grip, you can use with confidence 3、45# Steel: The chuck is made of 45# steel material, and the surface is blackening to prevent corrosion and rust 4、Longer Service Life: This chuck is stronger, has a longer service life, and has good flexibility, practical 5、High Clamping Force: Chuck has high clamping force, good holding stability, wear resistance, stable performance Specification Item Type: Pneumatic Grinder Collet Material: 45# Steel Purpose: Pneumatic Tool Accessories Surface Treatment: Blackening Treatment Colour: Black Model: S40A Applicable Pneumatic Grinder Models: For S40A, for S40-360, for S40-580 Package List 1 x Chuck