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Size: total length 100mm/3.97iinch; expansion tube length 40 mm/1.58inch; opening distance 8mm/0.32inch; punching diameter 10mm/0.39inch. Material: 304 stainless steel, durable, high-strength, corrosion-resistant. Packing: M8 expansion hook silver 2PCS Uses: used for brick walls, fences, anti-theft doors and windows, rain awnings, air-conditioning brackets, clotheslines, bathrooms, kitchens, toilets, home decoration, manhole covers, engineering, rigging, and anchoring hardware, etc. The perfect tool: The expansion screw hook is a solid structure. The expansion is produced by tightening the threaded bolt. The bolt pulls the tapered cone to expand the sleeve to the hole wall. After expansion, the tensile force is large, strong and safe, and heavy-bearing.