Corner Radius Template Fract. Small 1/4″-5/8″. Cut from fluorescent green material for maximum visibility! 1/4″, 3/8″, 1/2″ and 5/8″ 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.