Pack of 20 SRHS-M3-12 NBK Socket Button Head Cap Screws with Pin Made in JapanPack of 20 SRHS M3 12 NBK Socket Button Head Cap Screws with Pin Made in Japan Characteristics: Button head cap screws with pin at the center of their socket. They cannot be installed or removed by using standard tools. Install and remove by using Specialty Key. Application: Machinery, tools, equipment, and devices disassembly prevention. security measures, and safety measures Part Number M L D1 L1 B Key Part No. Quantity Per Pack SRHS M3 12 NBK M3