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 — power meets precision in your hands!

CORDLESS FREEDOM - 20V MAX brushless motor ensures longer runtime and maintenance-free performance.
POWER THROUGH CONCRETE - 1.4 joules of impact energy delivers fast, efficient drilling in tough materials.
VIBRATION CONTROL TECH - SHOCKS system drastically reduces handle vibration for all-day comfort.
VERSATILE MODE SELECTOR - Seamlessly switch between drill and hammer modes to tackle any job.
OSHA COMPLIANT DUST CONTROL - Compatible with DWH200D shroud and DWH161D1 extractor for safer, cleaner work.

The Dewalt DCH172B 20V MAX ATOMIC Rotary Hammer combines a powerful 1.4 joule impact energy with a lightweight 2.08 kg brushless motor design, delivering cordless convenience and superior vibration control. Engineered for professionals, it features a mode selector for versatile drilling and hammering, and supports OSHA-compliant dust extraction for safer job sites.

Specifications

Manufacturer	DEWALT
Part number	DCH172B
Item Weight	2.08 Kilograms
Product Dimensions	28.83 x 21.7 x 27.11 cm; 2.08 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

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