
A spanner or socket should always be your first choice but these are all valid alternatives for badly mangled nuts, broken wing nuts etc.

Amazon.co.uk
5.0
£19.99
WORKPRO 305 mm Ratchet Bar Clamp Set, 440 mm Spreader, Quick Release and One-Handed Clamp, Ideal for Woodworking and DIY Projects, Max 68 kg Load Limit, 2 Pack

Amazon.co.uk
4.0
£9.99
8Pcs Clamps Set, 4 Inch Quick Grip Heavy Duty Nylon Spring Ratchet Bar Clamps for Woodworking