unsure, attempting to put Arrow bar end mirrors integrated with rhinomoto bar end sliders, just don't know where to start?
I think it was a 10mm Allen key. Definitely a fat one!super easy - get a metric allan key - i'm pretty sure it's like a 10mm. Take the stock ones off - i believe the rhino bar ends use an 8mm but not 100% sure.
Make sure you put blue loctite on the threads before installing the rhinos - if this takes you more than 5 minutes - you've done something wrong