Made of Carbon Steel material with black coated.
A chuck require a key to provide the necessary torque to tighten and loosen the jaws.
Allows you to keep your drill bits firmly in place for difficult jobs.
Great for replacing lost or worn out drill chuck keys.

Specifications:
Color: Black
Material: Carbon Steel
Surface Treatment: Blackening
Gear Teeth Quantity: 11
Key Diameter: 3mm / 0.12 inch
Gear Diameter: 11.2mm / 0.44 inch
Total Size: 57 x 35mm / 2.24 inch x 1.38 inch(L*W)

Package Content:
1 x Chuck Key

Chuck Key Selection Method:
For 0.3-4mm drill chucks: key diameter about 3mm, gear diameter about 11.5mm
For 0.6-6mm drill chucks: key diameter about 5mm, gear diameter about 15mm
For 1.5-10mm drill chucks: key diameter about 6mm, gear diameter about 12.5mm
For 1.5-13mm drill chucks: key diameter about 6mm, gear diameter about 17.5mm
For 5-20mm drill chucks: key diameter about 9mm, gear diameter about 25mm
For 1-13mm, 3-16mm, 1-16mm drill chucks: key diameter about 8mm, gear diameter about 21mm

The above data is for reference only, only suitable for general models, except for special models