Stainless Steel Material This Open Expansion Hook set is made of high quality 304 stainless steel, with stable structure, high hardness, good sealing performance, wear and corrosion resistance, difficult to break and can be used safely. High Bearing Capacity The Open Cup Hooks Expansion Bolts is 41mm long and about 1cm in diameter, which enables it to achieve a good fixing effect and support up to 120kg. Quantity and Size There are 6 silver Open Hook Bolts per pack, each length is about 94mm (3.7 inches), the length of the extension tube is 41mm (1.6 inches), the diameter is 9.5mm (0.37 inches), the opening size of the hook is 18mm (0.7 inches), the diameter is 5mm (0.19 inches). Easy Installation Drill a hole of the same diameter as the expansion tube on the wall, place the expansion hook in the hole and tighten it with a spanner. The expansion is produced by tightening the bolts.After the force is applied, the housing expands and is firmly held in the wall. Area of Application Professional standard expansion bolt hook, very suitable for garage workshop, heavy construction, carpentry and home installation hammocks, hanging baskets, etc., a wide range of applications, can be used for concrete, masonry, ceiling, etc. Product name: Open hook bolt expansion Material: Stainless steel 304 Colour: Silver Quantity: 6 pieces Weight: 172g Package contents:6 x Hook bolts open expansion