1.All accessories are made of stainless steel for outdoor installationExcellent for marine and other outdoor applications 2.Use to mount a mast against buildings/houses 3.Accessories includeMain mounting bracket 2pcs ;Clamp V Jaw Bracket 2pcs ;U-Bolt 2pcs;Nuts 4pcs;Spring washers 4pcs ;Plain washers 4pcs ;Self tapping screw 4pcs All are made of stainless steel. 4.The whole set of accessories can be used for holding poles with diameters ranging from 1.1 to 1.97 in (30-51mm) ,Standoff from wall: 3.5 inches