Cracking stuff you can do with this gadget:

Tighten Wingnuts Large And Small Without Damage - Tighten Doughty Wingnuts - Fits M10 And M12 Bolts
Use In Pairs To Tighten Parcans Onto Lampbars - Easily Apply Or Remove Fittings Found On MACs and Movers
Outrig Your 8lites - Toprig Even A Source4 Zoom Profile - Ensure Tight Lock Off On All Hook Clamps
Tighten Half Couplers - Lanyard Attachment Point - Rather Fine Gold Rust Protective Finish

Undoes Tightened Shackle Pins! - Opens Beer!

Disclaimer
WingNutSpanner.co.uk sell these spanners for use by people who know what they are doing. Always ensure that you are using the spanner or any other tool for an appropriate use and that all items of rigging are being used for the purpose for which they were designed. Very tight doesn't necessarily mean safe! No responsibility is taken for injuries, loss damage etc.