Phoenix Contact Insulated Bootlace Wire Ferrules, AI Series, Special Colours. A range of insulated bootlace wire ferrules made from soft tin plated electrolytic copper with a polypropylene insulating sleeve with dimensions that conform to DIN 46228-4: 1990-09 and special colours. For suitable hand crimp tools see stock numbers ; 803-4405 803-4405 , ; 803-4427 803-4427 , ; 803-4402 803-4402 , ; 803-4411 803-4411 , ; 803-4424 803-4424 and ; 803-4420 803-4420