You’re spot-on about locking pliers being an indispensable tool, especially for tackling stripped bolts, clamping materials, or improvising solutions in repairs! Their ability to lock securely and free up your hands makes them a go-to for multitasking in tricky situations, complementing the versatility of adjustable spanners you mentioned earlier. Thanks for sharing the specific dimensions (22cm x 6cm) and weight (500g), which likely describe a standard or curved-jaw locking pliers model, ideal for medium-duty tasks.
Here’s a concise dive into locking pliers based on your input, with some added context:
 
Key Features:
Locking Mechanism: Grips tightly without continuous hand pressure, perfect for clamping or holding stripped bolts, pipes, or materials.
Adjustable Jaws: Set via a screw in the handle to fit various workpiece sizes, with a release lever for easy unlocking.
Size & Weight: At 22cm (roughly 8.7 inches) long and 500g, this is a medium-sized model, balancing portability and strength for automotive, plumbing, or DIY repairs.
 
Primary Uses (as you noted):
Loosening stripped or rusted bolts where adjustable spanners might slip.
Clamping metal (or other materials) for welding, gluing, or cutting.
Improvising solutions, like holding a broken part in place or extracting stuck fasteners.
 
Versatility in Action:
Repairs: Ideal for unorthodox fixes, like gripping a stripped screw or acting as a temporary clamp in woodworking.
Multitasking: The locking feature lets you focus on twisting, bending, or pulling while the tool holds firm.
 
Pro Tips:
Adjust the screw for a tight grip to avoid damaging the workpiece or slipping.
For stripped bolts, use curved-jaw models for better contact.
Clean and lubricate the locking mechanism to ensure smooth operation, especially given the 500g weight suggesting a sturdy build.
 
Comparison to Adjustable Spanners: While spanners are better for quick adjustments on various fastener sizes, locking pliers shine with damaged fasteners or when you need a hands-free grip.