Multifunctional Compasses Drawing Tools Spring Chart Planning Line Caliper Spacer Accurate Gauge Leather Tool Feature: 1. Precision mathematical compass - for mathematical geometry and artistic drawing. 2. Unique design prevents skidding while drawing. 3. Precise adjustment - adjusting knobs enables students to produce accurate geometry. 4. You can lock the compass in place and actually hold it as you write. 5. All metal material - made of high quality parts and strong construction, durable enough to last for a long time. 6. Three additional wires can be easily replaced when required. 7. Stability: compass with spring bow and thumb wheel can prevent accidental sliding. 8. Strong metal structure, compact size, light weight, very suitable for senior students and apprentices. 9. Suitable for drawing circle or arc, suitable for mathematics and painting teaching, and also an excellent tool for carpenters. Specification: Material: Metal Dimensions: 10.6 x 2.9 x 0.8 cm / 4.2 x 1.1 x 0.3'' Maximum circle radius: 4.6cm/1.8'' Color: Silver Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-2cm measuring deviation due to manual measurement. 1 X Compasses _x000D_