Corner Radius Template Set Fractions. Cut from fluorescent green material for maximum visibility! 1/4″, 3/8″ 1/2″ 5/8″ 3/4″, 7/8″, 1″ and 1-1/4″ radii. A center hole for each radius aids in perfect snap or rivet placement. These templates make it a snap (no pun intended) to accurately place a snap or rivet at the exact center of the corner radius. Eliminates the need for additional tools to measure and mark these locations.