... bolt 2)material stainless steel,iron 3)used for different places 4)good antirust functional 5)delivery quickly ... used in the joint place where need move often, for example: piano up and down cross board hinges, ... row hinge, piano hinge, heavy row hinge and bolt, small hinge, AA column, aluminum ladder column, stainless steel ... can inquire or conversation online. 2 inch bolts for doors & windows/small bolt