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 12V drill—don’t get left behind in the concrete game!

PRECISION MEETS POWER - Delivers up to 3,800 blows per minute with a 3/8" max drill diameter—perfect for professional-grade masonry tasks.
LIGHTWEIGHT YET RUGGED - Weighing just over 1 kg, it offers pro-level torque (265 in-lbs) without compromising portability.
SEAMLESS SYSTEM INTEGRATION - Part of Bosch’s 12V MAX Chameleon system, enhancing versatility without adding bulk or weight.
EXTENDED FLEXIBILITY WITH ATTACHMENTS - Works flawlessly with keyless chucks, lockbit holders, right angle, and offset attachments for every job scenario.
TRANSFORM YOUR DRILL INTO A POWERHOUSE - Convert your 12V drill/driver into a compact SDS-plus rotary hammer for heavy-duty concrete work.

The Bosch GFA12-H SDS-plus Rotary Hammer Attachment transforms compatible 12V drill/drivers into high-impact rotary hammers, delivering up to 3,800 bpm and a 3/8" drill diameter for efficient concrete drilling. Lightweight and part of the versatile 12V MAX Chameleon system, it integrates seamlessly with multiple attachments to expand your tool’s capabilities for professional-grade masonry work.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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Brand	Bosch
Model Number	GFA12-H
Product Dimensions	14.22 x 10.16 x 22.23 cm; 1.04 kg
Color	Black
Name List for Name Plates	Rotary hammer attachment
Material	Plastic Metal
Wallpaper Pattern	無地
Power Source	Corded Electric
Torque	265 Inch Pounds
Laser Class	Keyless Chuck
Included Components	(1) GFA12-H SDS-plus® Rotary Hammer Attachment (1) Side Handle (1) Depth Gauge
Are Batteries Included	No
Model Year	2023
Item Weight	1.04 Kilograms

BOSCH GFA12-H SDS-plus Rotary Hammer Attachment for Bosch GSR12V-140FC & GSR12V-300FC

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