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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Description

🔨 Upgrade your drill game — power, speed, and precision in one sleek attachment!

COMPACT VERSATILITY - Transforms your 12V Max Chameleon drill into a high-impact SDS-plus rotary hammer.
EXPAND YOUR TOOLBOX - Compatible with Bosch GSR12V-140FC & GSR12V-300FC for ultimate system flexibility.
SPEED THAT DELIVERS - Up to 3,800 blows per minute for rapid, efficient concrete drilling.
SEAMLESS INTEGRATION - Keyless chuck design for quick attachment swaps without missing a beat.
POWER MEETS PRECISION - 850 watts of pure rotary hammer force for professional-grade drilling.

The BOSCHGFA12-H SDS-plus Rotary Hammer Attachment converts your Bosch 12V Max Chameleon drill/driver into a compact yet powerful rotary hammer, delivering up to 850 watts and 3,800 bpm impact rate. Designed for professional versatility, it drills up to 3/8 inch into concrete with a keyless chuck for fast bit changes, perfectly complementing Bosch GSR12V-140FC and GSR12V-300FC models.

Specifications

Brand	Bosch
Power Source	Battery Powered
Maximum Rotational Speed	480 RPM
Color	Black
Included Components	(1) GFA12-H SDS-plus® Rotary Hammer Attachment (1) Side Handle (1) Depth Gauge
Special Feature	Keyless Chuck
Product Dimensions	5.6"L x 4"W x 8.75"H
Material	Blend
Number of Speeds	1
Item Weight	1.04 Kilograms
Maximum Power	850 Watts
Item Torque	265 Inch Pounds
Drill Type	Hammer Drill
Is Electric	Yes
UPC	000346659238
Drilling Capacity Wood	0.38 Inches
Manufacturer	BOSCH
Drilling Capacity Metal	9.53 Millimeters
Part Number	GFA12-H
Item Weight	2.28 pounds
Item model number	GFA12-H
Size	One Size
Style	Rotary Hammer Attachment
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Item Package Quantity	1
Special Features	Keyless Chuck
Batteries Included?	No
Batteries Required?	No

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