for Jacobs K4 Drill Chuck Key JCM3655P20, 3/8" Pilot Size Thumb Handle Steel for Keyed Drill Chucks,

for Jacobs K4 Drill Chuck Key JCM3655P20, 3/8" Pilot Size Thumb Handle Steel for Keyed Drill Chucks,

• Features a precision-machined 3/18-inch pilot that fits securely into the chuck gear. The exact pilot size ensures proper engagement with the chuck teeth, preventing stripping and extending both the key and chuck life .
• Manufactured from soft steel that limits the potential for dangerous fracturing under excessive load. This safety feature helps protect the chuck from damage by sacrificing the key under extreme torque conditions .
• Equipped with a nickel-plated thumb grip that increases leverage and user comfort during operation. The thumb handle design allows for better torque application while reducing hand fatigue during repeated tightening and loosening .