JONARD KN-7 ERGONOMIC CABLE SPLICING KNIFE Ergonomic Cable Splicing Knife - KN-7. The tough cutlery steel blade is extremely sharp and cuts easily through many types of insulation. It holds its edge with repeated use and features a non-slip easy grip ergonomic handle made from TPR (thermoplastic rubber) for better control and reduced hand fatigue.Blade length is 1¾" and overall length is 6¼"