Electric drill suitable for rock operation

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A small hole to hang yourself safely and to take the next step. Many rock climbers and cavers need to use tools for drilling in the face of new challenges. The electric hammer that does not require an external power supply is the most common tool for rock operations in the field. It can quickly and reliably drill a deep hole in the rock with strong impact. This article hopes to help those who need similar tools to choose the one that is most suitable for you. paragraph.
Here are those kinds of people called Hammer Drill, and the battery power supply voltage is greater than 24V. Here we look at it, it's still a little bit of meaning. As for what is commonly used in China, only one or two of them are available...
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Bosch 11225 vsr
This is the most used electric hammer in the country, and its battery has a power display function.

Voltage: 24v
Charging time: 3 hours unloaded rpm: 0-1200
Impact Force: 1 pound/inch maximum drill hole diameter on concrete: 3/4 inch Weight: 9.2 pounds

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Bosch 11225 vsr

Voltage: 24v
Charging time: 30 minutes per minute impact: 0-4000
No-load rpm: 0-1000
Impact force: 1.3 joules on the concrete maximum drilling diameter: 20mm
Weight: 4.1kg
Battery: NiCd 3.0 Ah

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