This one is 13mm and stronger.
model breakdown:
• cd: cordless drill
• 24: 24v platform (20v max actual)
• 13bi: 13mm chuck, b-type, industrial series
specification:
• battery: 20v max li-ion (as written on your box - red and yellow text)
• chuck: 13mm keyless chuck - bigger than the 10mm - can hold bigger drill bit
• motor: brushless motor - you can see "bl" icon at bottom of your box - means brushless, more powerful and lasts longer
• design: navy blue with red switch - industrial design
• free accessory: comes with free usb adaptor - as written on box
• certification: son certified - green logo at bottom right of your box
key features (icons on your box):
1. on/off switch
2. forward / reverse switch
3. 2-speed selector
4. brushless motor (bl)
5. led light
6. battery indicator