Pack of 10 SRFXS-M3-8 NBK Flat Head Screws with Hexalobular Socket with Pin Made in JapanSRFXS M3 8 NBK Flat Head Screw with Hexalobular Socket Made in Japan 10 Screws Characteristics: Flat Head Bolt with a Pin at the center of Hexalobular Socket: 1. It cannot be mounted or removed by normal tools. Use a dedicated wrench SRX for mounting and removing. Application: Machinery Tools Equipment Devices disassembly prevention. Part Number M L D1 L1 Applicable wrench Hexalobular Socket No. Quantity Per Pack SRFXS M3 8 NBK M3 8mm 6mm 1. 75mm SRX