Professional Quality, tested to 10, 000V & insulated to 1000V AC & 1500V DC for live line working. Manufactured from special tool steel, oil hardened & tempered. Smoothly ground accurate V shaped polished jaw head with locking adjustable screw for setting to the desired diameter. Can be used for solid or stranded wire up to 5mm (10mm&178;) diameter. Internal screw for one hand adjustment. Heavy insulated handles with slip guards for extra comfort & safety. Display packed. Tested to EN 60900