🔧 Key Features & Technical Specifications

• Motor Power: 1,100 W

• No‑Load Speed: 235–480 RPM

• Impact Rate: 1,350–2,750 BPM

• Impact Energy: 10 J

• Max Drilling Capacity:

  • Concrete: 40 mm (typical “optimum” drilling up to ~35 mm)

  • Wood/Core: 105 mm

• Chuck Type: SDS‑Max

• Weight: ~7 kg

• Construction: Robust, ABS housing (approx. 47.5 × 11.5 × 26.5 cm)

🛠️ Functional Modes & Features

• 3 Operating Modes:

  1. Rotation-only

  2. Hammer + rotation (standard drilling)

  3. Hammer‑only (chiseling)

• Variable Speed: Enables controlled starts and precision drilling

• Safety Clutch: Helps protect the user and tool if the bit binds

• Anti‑Vibration & Power‑Status Indicators: Alerts for service and operational conditions

📦 Included Accessories

• 2 SDS-Max drill bits

• Spare carbon brushes

• Depth gauge

• Grease for bit lubrication

• Side auxiliary handle

• Durable carry case

✔️ What It’s Good For

• Drilling up to 40 mm in concrete and much larger cores (105 mm)

• Light chiseling and demolition tasks thanks to hammer-only mode

• Suitable for general construction use—masonry, chiseling, and medium-load drilling

📌 Comparison with Professional Brands

This model’s specs are comparable to premium rotary hammers like the Makita HR4001C/HR4003C or Bosch GBH5‑40D: these also feature 1,100 W motors, ~40 mm drilling capability, SDS‑Max chucks, and impact energies in the range of 8–10 J, with no-load speeds around 235–500 RPM . The GRH4007‑240 offers similar functionality, though brand and build quality may differ.

⚙️ Summary Table

✅ Final Thoughts

The GRH4007‑240 is a capable mid-range rotary hammer matching many prosumer tools in spec. If you need SDS‑Max capacity, hammer-only chiseling, sturdy build, and a complete accessory kit, this is a competitive option