What are the types of pipe bending springs?

	There are two types of pipe bending springs: external and internal.
Springs for internal bending of pipes
	Internal tube bending springs are inserted inside the copper tube and help support the tube walls during manual bending. The use of a spring prevents the pipe from bending or deforming. The ring at the end of the inner spring is used to secure the wire or rope so that the spring can be removed if it goes out of reach inside the pipe.
Bending springs for outer tubes
	External tube bending springs are fed over the copper tubes and help support them under manual tension. External pipe bending springs are usually used on pipes with a diameter of less than 15 mm.
Hook and ring bending springs
	Some models of tube springs have a hook and ring at the respective ends. This allows you to tie several together for larger jobs.