325 x 13mm Hook & Loop Ties (10) Hook and loop ties are designed for computer installation so not to effect the signal going through the Cable, they are also a good all-round fastener solution for a number of other applications. Our Hook & Loop Ties are available in: Blue, Red, Green, Yellow & Black. Ideal use for Locking on Triggers when PAT Testing, being Yellow it is visually a better warning reminding the Tester to remove the Tie after Testing.