What is the largest size bit it will take?

The largest sds bit I have been able to find is 1 3/8 (trade size 1 inch emt hole) however in doing some digging product specifications specify 5/8 inch max bit still size

How well does it work with ground rod driver

I would say very well. Used a Bosh bit. 8 foot rod going into wonderful Mizzou red clay. Took about 2 minutes. I did add a little dish soap and water out of habit.

Has anyone used this with core bits?

2.5 inch holes thru 12 inch poured concrete with # 4 bar . 3 holes 1/2 hour each and bit looked like new . Tried bits made by CO-Z worked perfect had also bought Bosch bit just in case and returned it

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🔧 Power, Precision, and Comfort — Drill Like a Pro, Anywhere!

VIBRATION FREE COMFORT - DEWALT’s Active Vibration Control minimizes user fatigue during extended use.
PRECISION IMPACT CONTROL - 2.1 Joules of impact energy for rapid, clean drilling in concrete and masonry.
UNMATCHED POWER EFFICIENCY - Brushless motor delivers peak performance with longer runtime and less maintenance.
VERSATILE 3 MODE OPERATION - Easily switch between Drill, Hammer Drill, and Chip modes for any job.
LIGHTWEIGHT OSHA COMPLIANT - At just 2.9 kg, designed for all-day use and meets OSHA Table 1 standards with extractor.

The DEWALT 20V MAX SDS Rotary Hammer Drill (DCH273B) is a cordless, lightweight powerhouse featuring a brushless motor and 2.1 Joules of impact energy. It offers three selectable modes—Drill, Hammer Drill, and Chip—making it ideal for concrete, masonry, and versatile construction tasks. Equipped with Active Vibration Control for reduced user fatigue and designed to meet OSHA compliance when paired with the right extractor, this tool is engineered for professional-grade performance and durability.

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Manufacturer	DEWALT
Part Number	DCH273B
Product Dimensions	33.02 x 10.67 x 21.84 cm; 2.9 kg
Item model number	DCH273B
Size	1 pulgada
Colour	Black, Yellow
Style	Rotaty Hammer Only
Material	Metal
Power Source	Electric Power
Voltage	20 Volts
Wattage	20 watts
Maximum power	300 Watts
Torque	1.5 Foot Pounds
Item Package Quantity	1
Speed	1100 RPM
Special Features	Brushless Motor,Lightweight,Cordless
Included Components	1IN 20V MAX SDS PLUS ROTARY HAMMER
Batteries included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Ion
Item Weight	2.9 kg

DEWALT 20V MAX SDS Rotary Hammer Drill, Cordless, 3 Application Modes, Bare Tool Only (DCH273B)

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