Jacobs 30373C 1/2" Hand-Tite Keyless Hammerdrill Chuck 1/2-20 Thread 700 Series

700 Series--recommended for professional grade DC Rotary/ Hammer Drills Features & Benefits Carbide Jaw Bite reduces bit slippage and enhances wear resistance-even in the most demanding applications. Jacobs patented Hammerlock® technology provides a positive locking mechanism which prevents loosening in hammer and other high vibration applications. Jacobs patented Anti-Lock prevents chuck from locking open. Single sleeve versions available for drills with spindle locks to provide a larger gripping surface and one-handed tightening. Patented Torx® Technology for easy mounting. . Holds bits from 1/16" to 1/2" Chuck has 1/2-20 mount that fits drill motors with 1/2-20 spindles