BS type 394S17, EN. 4567. Metric Machine Screws: Stainless Steel. System Zero® Tamperproof Screws. Tamperproof security machine screws which require a special tool for insertion or removal. Suitabl...
Please refer to hand tools section for suitable Drivers. Metric Machine Screws: Bright Zinc Plated Steel. System Zero® Tamperproof Screws. Tamperproof security machine screws which require a specia...