Ratchkey HC-10 0"-3/8" 15/64" Pilot Ratcheting Chuck Key Pilot: 15/64" Made in USA Will fit 95% of common Jacobs KG & KG1, Skil, Makita, B&D and other 0~3/8" chucks. High impact polymer handle. Ratchet in one direction or the other, up to 120 lbs. or torque.