Some governments have directed that for safety reasons, all knives, sharp objects or cutting implements of any kind and of any length, whether of metal or other material, and some sporting goods must be packed in checked baggage. They cannot be carried in the cabin baggage nor on your person.
These items include (but are not limited to) knives (including household cutlery) and knife-like objects, box cutters, corkscrews, straight razors, metal nail files, scissors of any kind and of any length, dangerous goods (hazardous materials (unless approved)), tradesmen's tools, hypodermic needles (unless required for medical reasons), knitting needles, other sharp pointed/penetrating objects and sporting goods such as bats, bows and arrows, cues, darts, golf clubs and sling shots (catapults), martial arts devices, real/toy/replica weapons (whether plastic or metal).
These articles are likely to be removed and not returned. Passengers requiring the use of medical syringes in flight such as diabetics and other passengers with documented proof of medical need must ensure that it is professionally packed and labelled. If it is not, the medication is likely to be removed.
Check with your travel agent or directly with the airline concerned.