A Spanner or Adjustable Spanner is clearly the first choice but, for various reasons, it's not always possible to use them. Clamps, Locking Pliers or Manual pliers are great alternatives.
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Amazon.co.uk
5.0
£7.99
Aoyfuwell 3 Pcs Pliers Set, Pliers Tools Plier Set, Grip Hand Tools Kit, Long Nose & Diagonal Cutting & Side Cutters Set, Combination Wire Cutters Electrical...
-15%

Amazon.co.uk
5.0
£16.14 £18.99
INGCO 3Pcs High Leverage Pliers Set, 8" Combination Pliers and 7" Diagonal Cutting Plier and 6" Long Nose Plier HKHLPS2831
-9%

Amazon.co.uk
5.0
£11.18 £12.30
Draper Redline® 3 Piece 160mm Plier Set | Soft Grip Hand Tools Kit | Carbon Steel Long Nose Pliers | Combination & Diagonal Side Cutters | Hardened Jaws &...