How to Use a Wing Divider 1. Unlock the knurled knob to set a measurement in place. 2. Once you set your desired angle/measurement, lock the knurled knob. 3. Begin doing repeated measurements without continuously using a ruler/measuring tape! Ideal for: Woodworking Metalworking Leatherworking Drawing and Scribing circles and arcs Heavy Duty Carbon Steel Construction Built from high carbon steel, this divider will last you as long as you have it. It’s strong structural design prevents twisting during use. The metal needle tips are durable and will not wear down. THE COMPLETE BUNDLE Each ALLY Tools Divider Kit comes with Two Pencils and One Metal Pencil Sharpener so you can begin drawing circles and arcs right away. Start on your carpentry project with ALLY Tools and Parts! ALLY Tools 12 inch Locking Wing Divider INCLUDES Two Pencils and Sharpener ALLY Tools 8 inch Locking Wing Divider INCLUDES Two Pencils and Sharpener ALLY Tools 8 inch Spring Divider INCLUDES Two Pencils and Sharpener Add to Cart Add to Cart Add to Cart Customer Reviews 4.6 out of 5 stars 357 4.4 out of 5 stars 380 4.4 out of 5 stars 330 Price $17.97$17.97 $14.97$14.97 $14.97$14.97 Length 12 Inches 8 Inches 8 Inches Type Locking Wing Locking Wing Spring Max Circle Size (Scribing) 30 Inches 20 Inches 16 Inches Max Circle Size (Drawing) 31 Inches 21 Inches 17 Inches