M6 x 30mm countersunk socket screw in A4 marine grade stainless steel to ISO 10642. Hex key driven with a flush countersunk head - suited to machinery panels, access covers, and cabinetwork where a clean surface finish is required. A4 (316) gives outstanding saltwater and chloride resistance for marine, coastal, and pool use. Free next-day UK delivery on orders over £50.
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