Fully threaded self-drilling anchor stays for slope protection, rock support, various rock anchors and use for safety in tunnels. The bolts are usually used in demanding 

geological conditions with a disposable crown where the bolt is drilled in with simple and flexible connection to achieve the desired length. Shuddered/injected 

continuously or re-injected according to instructions from the designer.

Can also be supplied with an expansion shell if you want to use the bolt as a combination bolt in a pre-drilled hole to achieve an immediate mechanical anchoring.

Especially beneficial when you need long anchors and/or there is a lack of space and difficult installation conditions.