Type of drill bit needed

You need an SDS bit (that’s how it connects to the masonry drill).

I need to drill 1/2 inch holes in granite rocks maybe 4-5 inches deep, will this do the job or do I need a bigger unit ?

Yes this should handle that, I use it to drill 1/2 holes six inches deep in concrete regularly so granite should be fine. Remember the bits are SDS slotted drill system no chuck key required also a bonus.

Can it hammer only with out rotating?

No. 2 modes only. 1. Drill 2. Hammer Drill

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Description

🔨 Drill smarter, not harder — the cordless powerhouse for the modern pro.

SWITCH MODES IN A SNAP - Easily toggle between drill and hammer drill modes for versatile jobsite performance.
SMART VIBRATION CONTROL - SHOCKS system minimizes handle vibration, keeping your hands steady and comfortable.
WORK LONGER FEEL LIGHTER - At just 2.09 kg, this rotary hammer reduces fatigue during extended projects.
OSHA COMPLIANT DUST MANAGEMENT - Pair with DWH200D shroud and DWH161D1 extractor for safe, clean operation.
POWER THROUGH CONCRETE LIKE A PRO - 1.4 joules of impact energy delivers fast, precise drilling in tough materials.

The Dewalt DCH172B 20V MAX ATOMIC cordless SDS PLUS rotary hammer combines 1.4 joules of impact energy with a lightweight 2.09 kg brushless motor design. Featuring SHOCKS vibration control and a quick mode selector, it delivers efficient, comfortable drilling in concrete and masonry. OSHA-compliant when paired with compatible dust extraction accessories, this tool is engineered for professional-grade performance and all-day jobsite endurance.

Specifications

Manufacturer	DEWALT
Part number	DCH172B
Item Weight	2.09 Kilograms
Product Dimensions	28.83 x 21.7 x 27.11 cm; 2.09 kg
Item model number	DCH172B
Size	One Size
Color	Yellow
Style	Classic
Finish	Brushed
Material	Blend
Pattern	Solid
Shape	Rectangular
Power source type	Battery Powered
Voltage	20
Maximum Power	300 Watts
Item Package Quantity	1
Speed	7.92E+3 RPM
Special Features	Brushless Motor, Compact, Cordless, Keyless Chuck, Lightweight, Reverse Rotation, Variable Speed, Vibration Control Handle
Included components	(1) 360° Side handle, (1) Belt hook, (1) DCH172 Rotary hammer, (1) Depth rod
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Ion
Battery Capacity	2 Amp Hours