Mars Comfort Staedtler quick adjustment compass with extension Compass set containing 552 compass with lead tube, extension, universal adapter and spare parts. Quality and functionality combined with exceptional design. Easy-adjustable arms, non-slip needles and lead clamps. Quick adjustment compass with universal adapter and lead canister. Fixed lead and needle attachment. Interchangeable mine with Ø 4 mm stem. The needle is also interchangeable. Maximum circle diameter approx. 350 mm, with extension approx. 585 mm. Length 170 mm. Comes in a plastic case. Brand: Staedtler.