After driving the expansion screw into the hole on the ground or wall, tighten the nut on the expansion bolt with a wrench, and the bolt goes out. But the outer sleeve does not move, so the under the bolt expands the sleeve to fill the entire hole. Widely used in fences, anti-theft doors and windows, rain sheds, engineering, etc. Features - Color: Silver. - Material: Stainless steel. - Size: 8.60 x 1.80 x 1.80cm/ 3.38 x 0.71 x 0.71 inch. - The heavy duty anchor bolt is made of stainless steel, waterproof, abrasion resistant, , never rust and . - Expansion screw bolts can be used in concrete and masonry. - Widely used in fence, burglarproof doors and window, canopy, air conditioning rach fixation, home decoration, engineering, etc. - Easy to install, drill a , clean the sand and soil in the hole, insert the expansion screw into the hole. - And use a wrench to tighten the nut of the expansion of the wall hole. Package list: 6 x expansion bolts