Line 6 say...
Before you say to yourself "£78.99 for eyebolts?!?!?! That's crazy! I'll just go to (insert favorite hardware store) and get some for £8!".
These bolts cost that much because they are certified and specifically rated to hold the weight of our speakers. The cheapy alloy bolts at the hardware store might work great to fix your fence at home or hang a bicycle in the garage. But if you plan to use them to hang these speakers, you're going to end up spending a lot more than £78.99 when the bolts break and your speakers come crashing down from the ceiling, or even more money in civil lawsuits and lawyer fees if they fall on someone's head in your venue.
Don't say we didn't warn you!
Line 6 advises you to consult a rigging professional before hanging any speakers.