In today's competitive market place time is of essence when it comes to fixing situations. Backpackers are made in increments of 1mm thick which are colour coded for easy identity. Backpackers have unique comb grippers and locating lugs which prevents the packer falling off the fixing before torque is applied. Yellow = 1mm, Green = 2mm, Blue = 3mm, Red = 4mm, Brown = 5mm, Black = 6mm.
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