Amazon: radius template
Pacific Arc Circles Radius Master Template Guide, from 1/2 Inch to 3 3/4 Inch Radius and 36 Perfect Circles from 3/64 to 1 Inches. 4.5 out of 5 stars. 117. $11.89. $11. . 89. Get it as soon as Wed, Dec 8. FREE Shipping on orders over $25 shipped by Amazon.
