FABER-CASTELL Quick-Adjust harppi Stream Blackstone

Drawing precise circles and arcs can be frustrating with traditional compasses that require constant manual tightening and risk slipping mid-draw. The FABER-CASTELL Quick-Adjust Compass Stream Blackstone solves this with a push-button mechanism that lets you set the radius instantly and securely, so your focus stays on your work, not your tool.

Who is it for

Students, architects, engineers, and technical illustrators who need reliable geometry tools for school, university, or professional drafting. It suits anyone who values speed, precision, and comfort during long drawing sessions.

Main features

• Push-button quick-adjust mechanism for fast, precise radius setting without screws
• Hinged legs with knee joint allow fine adjustments and stable positioning
• High-quality zinc die-cast metal and durable plastic construction for long life
• Blunt safety needle reduces risk of injury while providing a firm centre point
• Ergonomic grip zones offer comfortable handling during extended use
• Universal lead clamp holds standard 2 mm leads securely
• Maximum circle diameter of 340 mm covers most drawing tasks
• Includes spare leads and a sturdy protective case for storage and transport

Specifications

• Compass type: Quick-adjust bow compass
• Adjustment mechanism: Push-button with spindle fine-tuning
• Material: Zinc die-cast metal and plastic
• Colour: Black and silver
• Compass length: approx. 170 mm
• Max circle diameter: 340 mm
• Lead diameter: 2 mm
• Needle type: Blunt safety needle
• Included accessories: Spare leads, protective case

Tips

To extend the life of your compass, retract the lead and needle after each use and store it in the included case. For ultra-fine circles, use a sharpened lead and apply gentle, even pressure while rotating. The quick-adjust button can be operated with one hand, making it easy to tweak the radius without lifting the compass from the paper.