Sign Standoff Screws Advertising Screws Stainless Steel Wall Standoff Mounts Glass Acrylic Nail, 8 Pieces (1 x 2 Inch) 1 x 2 Inch auspowers_batchthree positive joint action with no B0D8ZX459P positive joint action with no chance of slipping position or coming apart under load the black napkins may come off when meet water each standoff screw has 2 pieces rubber cushion to protects your signs Read more Detailed Steps for Use Use electric drill to punch holes in the wall (the size of the drill bit can be determined according to the size of the expansion tube) Hammer the expansion tube into the wall with a hammer Unscrew the base and screws of the advertising nail Read more Detailed Steps for Use（Continued） Pass through the base with a screwdriver (from the direction of the large mouth to the small hole inside the base screw) tighten Screw rod through the billboard sign