A standard in-line 4mm banana plug with a stainless steel contact spring.The large rear diameter of this plug will accept cables with a conductor of up 5,5mm (10 awg). The lead wire can be held either by soldering in a large solder bucket, or by a set screw. When the cable is held by the set screw, the solder bucket can also be crimped for added strength, (suitable crimping The product is also supplied with a large diameter insulating cover that accepts cables with a maximum outside diameter of 7,1mm.tool - Daniels Manufacturing D36 Hydraulic Crimper).The product is also supplied with a large diameter insulating cover that accepts cables with a maximum outside diameter of 7,1mm.