What is the name of the tool I need??

Leslie Knight

I need to pull my crank off. In the past, I've used a tiny little tool that basically inserts into the hollow on the non- drive side and turn it and it loosens and then the crank comes off. I've lost the little tool. The cranks are Shimano Ultegra and the hole is a star with eight points. I went onto Performance Bikes and I think it's called a crank puller. Makes sense. But which one?  Options are "crank puller" and "crank puller for square taper cranks".  Pretty sure it's the former, but hard to tell from the pic or description. 
Thx!!

Gary Lewis

Is this what you are looking for: 

SHIMANO TL-FC16 CRANKSET ARM TOOL

Leslie Knight

I was at a cyclocross clinic today and asked the mechanic. It's an adjusting cap tool. That name make no sense but he pulled it up on his phone I ordered that. 

DAVID RICHMOND

U dont need any tool beside an allen key if it's a shimano octalink and if u still have the cap on the crank:
https://www.youtube.com/watch?v=mxAj-zbynPI

.... if u don't have the cap in the crank, then u need a crank remover tool (check vid from 40s to 1'40)
https://www.youtube.com/watch?v=cPQyQnNdews

DAVID RICHMOND

if u need a crank puller, make sure the part that will press in is big enough and does not mess up the inner thread... best to do it with an extracting cap like in the 1st vid