Copper Trace Crimps allow you to build exceptionally neat and streamlined multi hook rigs in a matter of seconds and no anglers tackle box should be without them. These are designed to fit lines of approximately 50 to 60 lb, they can be a bit tight for some 60lb lines so check the diameter of your trace body to make sure its not too thick. Like all crimps they should be fitted by crimping them lightly into position using crimping pliers to avoid damaging the mono. Internal Bore 0.83mm and 8.4mm long. 200 Crimps Per Pack.