These cap head hex socket screws are made of 12.9 grade alloy steel with oxidation surface, which are resistant to rust and corrosion. Type: Cap Head Hex Socket Screw. Function: Fastener. Screw Thread Lengths: 4mm(20Pcs), 5mm(20Pcs), 6mm(20Pcs), 8mm(20Pcs), 10mm(20Pcs), 12mm(20Pcs), 16mm(20Pcs), 20mm(20Pcs), 25mm(20Pcs).
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