Chain splitters. Recommend a strong one

This one from park is great, super stiff, and it comes in a specific 1/8" size (CT-7 i think, also fits massive 3/16" chains). I use it in the workshop nearly every day and i've had it for fookin ages!

+1 for that bad boy, i've had mine for 4-5 years, absolutely bullet proof, lasts forever, think I bent like one pin on it thats it.