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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Description

🔧 Power, Precision, and Comfort — The Ultimate Cordless Hammer Drill Experience

LIGHTWEIGHT YET RUGGED - At just 6.4 lbs, this rotary hammer is engineered for heavy-duty tasks without weighing you down.
UNMATCHED CORDLESS FREEDOM - Cut the cord and conquer concrete with DEWALT’s 20V MAX brushless motor delivering peak power anytime, anywhere.
OSHA COMPLIANT SAFETY READY - Pair with the DWH303DH On Board Extractor for OSHA Table 1 compliance—because safety never goes out of style.
PRECISION AT YOUR FINGERTIPS - Switch seamlessly between Drill, Hammer Drill, and Chip modes with the intuitive rotating dial for tailored performance.
VIBRATION CONTROL FOR ALL DAY COMFORT - SHOCKS Active Vibration Control minimizes hand fatigue, letting you work longer with less strain.

The DEWALT 20V MAX SDS Rotary Hammer Drill (DCH273B) is a cordless, brushless power tool featuring 2.1 joules of impact energy and three selectable modes (Drill, Hammer Drill, Chip) for versatile concrete and metal drilling. Lightweight at 6.4 pounds with SHOCKS Active Vibration Control, it ensures reduced user fatigue and OSHA compliance when paired with the right extractor. Designed for professionals demanding power, precision, and portability in one rugged package.

Specifications

Brand	DEWALT
Power Source	Battery Powered
Maximum Rotational Speed	1100 RPM
Voltage	20 Volts
Maximum Chuck Size	20 Millimeters
Color	Multi
Included Components	DCH273 Rotary Hammer \| 360° side handle \| Depth Rod \| Adjustable Hook
Special Feature	Brushless Motor,Lightweight,Cordless
Product Dimensions	13"L x 4.2"W x 8.6"H
Material	Blend
Maximum Torque	1.5 Foot Pounds
Speed	2800 RPM
Item Weight	6.4 Pounds
Maximum Power	300 Watts
Item Torque	1.5 Foot Pounds
Drill Type	Hammer Drill
UPC	885911405102
Global Trade Identification Number	00885911405102
Drilling Capacity Wood	1 Inches
Manufacturer	DEWALT
Drilling Capacity Metal	1 Inches
Part Number	DCH273B
Item Weight	6.4 pounds
Item model number	DCH273B
Is Discontinued By Manufacturer	No
Size	One Size
Style	Rotaty Hammer Only
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Wattage	20 watts
Item Package Quantity	1
Special Features	Brushless Motor,Lightweight,Cordless
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Ion
Warranty Description	3 year limited warranty

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