I had one for year but lost it so her goes a new rothenberg 15mm spring.
Does the job as required - usual Toolstation good service ie ready for collection after ordering online
Although bending springs work well for plastic pipe and conduit, unfortunately it seems that they do not work for copper pipe, notwithstanding claims and instruction videos to the contrary. At least, not with the copper pipe that Toolstation sells. It is possible to use this to make extremely gentle bends, but not for bending e.g. over the knee: however gentle you are, the pipe buckles. If you're unlucky, it also traps the spring.
It isn't good or fit for bending properly or difficult to get it out of pipe
The spring is good quality but the downnside is i had to return it to the shop as it was not fit for purpose. The spring was very loose in the copper pipe causing it to kink when bending.
Doesn’t fit the pipe , too big
Not used it yet but with rings on either end you should be able to pull it either way inside the pipe
Bending spring copper pipe 15mm or PVC ideal to make pvc bends at smaller deg bend with heat too help get the desired angle