Closed with a wrench, this steel quick link is an almost permanent docking. Detailed description. Descriptive. Closed with a key, it becomes a quasi-permanent mooring ring. Available in three versions (wire diameter 10 mm, 8 mm, 8 mm with support bar from CROLL to harness) and also in black version. Specifications. Material(s): steel. Certification(s): CE EN 362 type Q. References.