High-strength hexagon socket screw set, blackened, GB/T70.1 standard-Contact customer service before placing an order

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10.9 Grade Quenched Black Hexagon Head Bolts M8-M24 Hardware Fastener Set-Contact customer service before placing an order

GB/T70.1 Hexagon Socket Head Cap Screws High Strength Quenched and Blackened Rust-proof Hardware Tool Set-Contact customer service before placing an o