What is the difference between gsr12v-300b22 and gsr12v-300fcb22 in the performance/power as a drill and driver? thanks

The same motor different bodies.

Where is this made from?

The country of origin of the GSR12V-300FCB22 is Malaysia. Robert Bosch Tool Corporation utilizes a global manufacturing strategy, which incorporates a global network of suppliers with our worldwide manufacturing locations in regions such as Asia, Europe, and the United States. Our manufacturing facilities around the globe are all owned and operated by the Bosch Group and maintain the highest quality standards. You can be assured that whatever country your Bosch product was made in, it will be made with the quality you would expect from Bosch. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST.

What is the maximum drill bit size for the keyless chuck?

It's a 3/8" chuck. It'll even chuck up 1/2" bits with a reduced shank. If you're using spade bits, I've used it with up to 1 3/8", on low speed

The Bosch Power Tools in North America are all 110/120V power rating. If you will use this on 220/240V, you will need to get a power converter to step down the voltage that you have in your area. For further assistance, contact us at 1-877-BOSCH99 (1-877-267-2499) from Mon-Fri 7A-7P CST.

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⛏️ Power up your drill game—don’t get left behind!

ERGONOMIC CONTROL - Includes side handle and depth gauge for steady, accurate drilling every time.
COMPACT POWERHOUSE - Lightweight 1.04 kg design packs 850 watts for serious concrete drilling without bulk.
TRANSFORM YOUR DRILL - Instantly convert your 12V Max Chameleon into a high-impact SDS-plus rotary hammer.
SEAMLESS SYSTEM EXPANSION - Part of Bosch’s FlexiClick 5-in-1 system—add versatility with keyless chuck, right-angle, and offset attachments.
PRECISION CONCRETE DRILLING - Up to 3,800 blows per minute and 3/8 inch max diameter for professional-grade results.

The Bosch GFA12-H SDS-Plus Rotary Hammer Attachment transforms your 12V Max Chameleon drill/driver into a compact yet powerful rotary hammer, delivering up to 3,800 bpm and drilling up to 3/8 inch into concrete. Lightweight and part of the versatile FlexiClick 5-in-1 system, it offers professional-grade performance with ergonomic features like a side handle and depth gauge for precision and control.

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Manufacturer	Bosch
Part Number	GFA12-H
Product Dimensions	14.22 x 10.16 x 22.23 cm; 1.04 kg
Item model number	GFA12-H
Style	Rotary Hammer Attachment
Material	Metal
Power Source	Battery Powered
Maximum power	850 Watts
Item Package Quantity	1
Special Features	Compact, Keyless Chuck
Included Components	(1) GFA12-H SDS-plus® Rotary Hammer Attachment (1) Side Handle (1) Depth Gauge
Batteries included?	No
Batteries Required?	No
Item Weight	1.04 kg

BOSCH GFA12-H SDS-Plus® Rotary Hammer Attachment

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