Feature: 【Firmly Mounted】Hollow cavity metal anchors fixings come with a bolt and hollow nut, when When the bolt is tightly pulled outward, the nut tightens with it, creating a petal shape on the plate and clamping the plate tightly to hold the item securely in place, which is not easy to fall off. 【Suitable for Hollow Materials】Hollow bolts anchors are specially designed for use with hollow materials that can be used with the plate with the thickness of 0-5mm/0.19in, making them ideal for hollow doors, hollow walls or hollow plywood. 【Easy To Installation】Hollow cavity anchors can be installed in just a few steps.1. Drill a hole the same width as the metal retaining nut. 2. Insert the anchors into the holes and adjust the screws in the anchors. 3. Clamp the bolts with a tool and tighten them outward until the nuts are completely closed and snug. 4. Secure the item to the nuts with the screws and tighten with a screwdriver. 【Premium Material】Hollow cavity metal anchors fixings are made of 4.8 grade Q235 carbon steel with galvanized surface for good hardness and not easy to deform; the galvanized layer gives it good corrosion resistance and rust resistance for long term use. 【Wide Application】Hollow bolts anchors can be used for any shallow hollow plate with thickness of 0-5mm/0-0.19in that can be installed on metal sheet, hollow-door, hollow-wall, paneling, hollow plastic pipe and more for fixing objects, hanging objects, etc. Specification: Name: Hollow Cavity Metal Anchors Fixings Material: 4.8 Grade Q235 Carbon Steel Model: M4*20, M5*25, M6*25, M8*30 Size: As Shown Weight: As Shown Package Included: 10 * Hollow Cavity Metal Anchors Fixings 【Firmly Mounted】Hollow cavity metal anchors fixings come with a bolt and hollow nut, when When the bolt is tightly pulled outward, the nut tightens with it, creating a petal shape on the plate and clamping the plate tightly to hold the item securely in place, which is not easy to fall off. 【Suitable for Hollow Materials】Hollow bolts anchors are specially designed for use with hollow materials that can be used with the plate with the thickness of 0-5mm/0.19in, making them ideal for hollow doors, hollow walls or hollow plywood. 【Easy To Installation】Hollow cavity anchors can be installed in just a few steps.1. Drill a hole the same width as the metal retaining nut. 2. Insert the anchors into the holes and adjust the screws in the anchors. 3. Clamp the bolts with a tool and tighten them outward until the nuts are completely closed and snug. 4. Secure the item to the nuts with the screws and tighten with a screwdriver. 【Premium Material】Hollow cavity metal anchors fixings are made of 4.8 grade Q235 carbon steel with galvanized surface for good hardness and not easy to deform; the galvanized layer gives it good corrosion resistance and rust resistance for long term use. 【Wide Application】Hollow bolts anchors can be used for any shallow hollow plate with thickness of 0-5mm/0-0.19in that can be installed on metal sheet, hollow-door, hollow-wall, paneling, hollow plastic pipe and more for fixing objects, hanging objects, etc.