BS 7671:2008 (17th Edition) Compliant, Exceptional wire-range capacity — three colour-coded models handle wire combinations from as small as 0.5 mm 2 to as large as 10.0 mm 2, Accept solid & stranded wire, Ribbed cap provides a secure grip & fast fingertip starts, Swept wings offer extra leverage & less effort for large wire combinations, Flame retardant shell, Hexagonal shape accommodates standard nutdriver for tool installation, Live-action; square-wire spring locks onto wire for safe; secure connections, Deep skirt helps protect against flash-over & turned-back strands for maximum dielectric protection, Reusable, Cost effective replacement for terminal blocks, Conform to EN 60998-1:2004; EN 60998-2-4:2005 connecting device standards