The traditional downspout bracket is made of thick galvanized steel. It is hinged on one side and has a screw on the other side. Two (2) brackets per downspout (10') is recommended. Should you damage your downspout, you can easily open the bracket to change the damaged downspout. The legs protrude 1" so you always get air behind the downspout. You fasten the downspout bracket with two (2) screws or fasteners per bracket. What kind of fasteners to use is defined by your siding material and what is recommended for that. You do not put any screws into the downspout itself.