This hex socket screw kit of allen head screws with the most common hexagon socket screw - all in a high quality plastic caseWork greatly to fix & tighten the screws and replace a lot screwsWidely used for equipment, home improvement, shop, garage, home use, car and other accessories connectionHigh hardness carbon steel hex socket screws, hard enough for no striping out as plastic or aluminumPackaged and assorted in a plastic case, convenient and easy for use & storage Color: BlackMaterial: Carbon SteelSurface Coating: Black ZincGrade: 12.9Fastener Type: Socket ScrewsHead Style: Hex HeadDrive Type: AllenQuantity: 200PCSApplication: Equipment, Home Improvement, Shop, Garage or Home Use, Car and other Accessories ConnectionType: Hex Socket ScrewIt contains the following sizes:20PCS * M3x320PCS * M3x420PCS * M3x620PCS * M4x420PCS * M4x620PCS * M5x520PCS * M5x820PCS * M6x620PCS * M6x1020PCS * M8x8