ALFER Snap-off connector type LL composed of a single steel body with 16mm diameter, shaped for mechanical hooking to the wood. It is threaded with a continuous screw pitch 6 R3 composed of an external spiral with constant diameter and the internal tapered thread is conical with reverse adaptation. The intermediate part is without thread (maximum shear position) and the head is specifically designed with snap-off system to facilitate the boarding installation. Steel with yield strength at 590 Mpa.