2 Pack Metal Compass with Lock Math Bow with Wheel Geometry Compass Divider Precision Student Compass for Drafting, Drawing, Measuring PORTABLE DESIGN: Our compass tool includes adjustable wheel and locking mechanism two parts. Making the compass in place you need and keep it stay when writing, no slipping. ADJUSTABLE SIZE: These metal compass measures 6 inches long, creates circles up to 10 inches in diameter ,suitable for drawing all kinds of circles. All METAL MATERIAL: Compass drawing is made from high quality parts and solid construction, durable enough to use that can be last for a long time. Bow structure compass makes it more cool than traditional compass. EASY TO USE: Our precision compass can hold tight and lock in place ,with this adjustable wheel, no more slipping from fingers, helping you to make perfect circles, so convenient for use. Additional leads are also easy to replace when needed. WIDE APPLICATION: The compass drawing tool suits well for student, teacher, artist, architect, mathematician, engineer, woodworking and carpenter, perfect for geometry drawing and school-math learning. Free Bonus: Compass*2, additional leads* 12, nuts* 4,screws*4.