Screw PostProduct Details1.Installation - Make a hole between 0.5-1mm larger than the diameter of the female rod, put the screw and nut on both sides of the locked object, and select the appropriate tool to lock it.2.Application - Fit for all kinds of DIY, leather crafts, clothing making, or as a fastener to connect two objects. Such as thin photo albums, leather bags, wooden board connections, etc.3.SIZE - Applicable Hole Dia: 3/8"(10mm); Under Head Size(Male): M8 x 50mm(D*L); Under Head Size(Female): 10 x 18mm(D*L); Screw Head Diameter: 16mm4.Notice - The thickness of the object which is locked, must be less than the length of the screw rod + nut rod, otherwise, it will not be able to tighten.5.Advantage - Precision mechanical thread, made of carbon steel material, nickel plated finish, high hardness.