M3 COUNTERSUNK ALLEN KEY BOLTS A2 STAINLESS STEEL DIN 7991 BOLT SOCKET SCREWS. M3 SOCKET COUNTERSUNK ALLEN KEY SCREW BOLT A2 STAINLESS STEEL DIN 7991. Standard DIN 7991. Countersunk Socket Head Screws feature a countersunk head type, which essentially allows them to sit flush.
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