Rear cassette loose

Unknown
edited December 1969 in MTB workshop & tech
Hey, should of posted here but my cassette is starting to come loose but hasnt fallen apart, yet ! im unsure of which tool i need to use as they look very similar,

the cassette i have is a shimano cs-hg 50

which tool should i get,Tool 1 ,Tool 2

I have read the park tools section on cassettes and its confused me lol, as i just need to tighten the cassette do i need a sprocket chain whip? also is this the only tool needed ?

cosstick!

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