The 5-piece Aristo geometry set is a reliable and precise companion in math lessons at school and technical training in professional school and university By pressing the two locking handles, the compass can be quickly adjusted. The fine adjustment is made by subsequent turning on the centre wheel of the compass Both legs have a joint and can be bent. The clamps for the needle and the lead are non-slip. The maximum circle diameter is 340 mm The compass is made of die-cast zinc and the head is made of plastic. It can accommodate inserts, such as extension rods or the adapter for pins with a diameter of up to 4.0 mm Box contents: Aristo AR80084 college drawing set: 1 x compass, 1 x box with 2 replacement compass leads and 1 x replacement compass needle, 1 x 0.5 mm lead pencil, replacement leads for pencil 0.5 mm, 1 x universal adaptor