Used to fix items where there is a cavity behind the surface.Combination head on the screw to accept both slot and cross-recess screw drivers.High-performance cavity fixing. Perfect for fixing heavy objects securely on soft-faced partition boards. All metal cavity fixing fitted with expanding arms to spread out behind the board providing a large load bearing area. Fitted with anti-rotation teeth ensure a firm anchorage and bonded washer with integral thread for increased reliability. All metal construction for heat resistant applications. Specialist fixing guns are available for repetitive fixing applications.colour: SilverMaterial: metalsize: M5*37mmPackage Contents: 5*Expansion boltOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.