Tested and approved for use in many of Simpson Strong-Tie's best-selling connectors for both interior and most exterior applications Ideal for use in connector applications where more control is desired or using a hammer is inconvenient 1/4-in. hex head with 0.370-in. diameter integrated washer reduces cam-out and is stamped with the Simpson Strong-Tie "" sign and the fastener size for easy identification after installation Shank is specifically designed to match the fastener holes in Simpson Strong-Tie connectors Optimized heat treating for ductility and strength