All secateurs are designed to be used for cutting up to a maximum of 15mm thick branches.
You should never cut dry branches which will cause the damage of both the blade and branches. All secateurs should be used for only cutting living branches.
When you cut the branch, please cut in angle and do not twist the blade while cutting.
Please dry properly after use and put some oil around attached screw for preventing from rust.
If you want to sharpen secateurs by yourself please use whetstone. Stones come in a variety of grades, from rough (low number of grits) to ultra fine (high number of grits). 1000 grit for ordinary sharpening. 3000 grit for polishing.
Please contact us if you are not sure how to maintain your secateurs. We are glad to help.