Compass for blackboard use, 40cm long, hard plastic, with metal butterfly screw for adjusting tightness. Holder with spring mechanism, adjustable for round and square chalk, interchangeable suction foot and compass point in soft plastic

Maths Teaching Kits School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Compass Maths Teaching Kit used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Maths Teaching Kits for Engineering Teaching Lab in Universities