Hamerboor Bosch GBH 2-21 Professional 720W SDS Plus, 2,1 cm, 2J

The Bosch GBH 2-21 Professional is a 720W SDS Plus hammer drill engineered for efficient concrete drilling up to 2.1 cm diameter. It combines a compact body and low weight of 2.3 kg with an impact energy of 2 J and an impact rate of 4,800 bpm to deliver steady performance for drilling and light chiselling tasks. The tool's compact dimensions (88 mm width, 334 mm depth) and ergonomic design support controlled handling in confined spaces while the AC power source ensures continuous operation on site.

Advantages

The GBH 2-21 Professional offers reliable percussion performance with consistent impact energy of 2 J and a high blow rate for effective material removal in masonry and concrete. Its SDS Plus chuck enables fast, tool-free bit changes and secure bit retention for sustained work. At 2.3 kg the unit is relatively lightweight for its class, reducing operator fatigue during extended use. The compact housing improves accessibility in tight areas and the two-mode functionality supports drilling and hammer drilling as required.

Suitable for

• Drilling holes in concrete and masonry for anchors and dowels up to 2.1 cm diameter
• Installing electrical boxes, conduit and plumbing fixtures in solid substrates
• Light chiselling or demolition tasks where controlled impact energy is required
• Work in confined or overhead spaces due to compact size and balanced weight

Key specifications

• Motor power: 720 W
• Impact energy: 2 J
• Impact rate: 4,800 bpm
• Maximum drilling diameter in concrete: 21 mm
• Chuck system: SDS Plus
• Weight: 2.3 kg
• Product colours: red, blue, black
• Overall width: 88 mm; depth: 334 mm
• Power source: AC (mains)

How to use

Before use, select the appropriate SDS Plus drill bit for the required hole diameter and insert it into the chuck until it locks. Secure the workpiece or ensure stable standing position, mark the drilling position and align the drill perpendicular to the surface. Start drilling at low speed to establish the hole, then apply steady pressure while allowing the hammer action to do the work. For overhead or prolonged tasks, maintain a firm two-handed grip and take regular breaks to avoid fatigue. Switch between drill and hammer modes as needed following the tool's mode selector.

Recommendations

Use compliant personal protective equipment including eye and hearing protection and dust mask when drilling concrete. For optimal performance and service life, use drill bits designed for SDS Plus shanks, avoid excessive side load, and allow the motor to cool under heavy continuous use. Inspect bits for wear and replace them when necessary. Connect the tool to a properly rated mains outlet and follow local electrical safety rules.