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✔ Meets/Exceeds: DIN 912, ISO 4762 ✔ 12.9 Grade Alloy Steel,Black Oxide Finish Min. Tensile Strength 176,900 psi ✔ Screw Head Style: Socket Cap; Screw Drive Style: Hex Socket, Known as Internal Hex Drives ✔ Easy to store : These Screws Come in an Easy-use Storage Box Item--------------Thread Length-------Total Length M8 x 30mm-----------30mm------------38mm M8 x 35mm-----------35mm------------43mm M8 x 40mm-----------40mm------------48mm M8 x 45mm-----------45mm------------53mm M8 x 50mm-----------50mm------------58mm Package Contains: M8 x 30mm-------4 Pcs M8 x 35mm-------4 Pcs M8 x 40mm-------4 Pcs M8 x 45mm-------4 Pcs M8 x 50mm-------4 Pcs Total-------------20 Pcs