The spiral-shaped outer ribs cut a positive fit in the soft building material, thus ensuring the best pressure distribution and load-bearing capacity. Can be applied with a hammer - there is no need for special tools, thus saving time and money for the installation. The GB can also be used safely outside (e.g. in façade installation) when combined with the approved fischer safety screw in A4., Weight: 0.2866009406 Pounds, Manufacturer: fischer