http://www.machinemart.co.uk/shop/pr...nd-accessories
You can either get it of 'tinternet, telephone or go into the shop.
It's indestructable, but maybe a bit more than you need (I have three bikes, so it works well for me). You can buy spares if by some remote chance you break something, or more often, lose something!
Easy to use.
It will split a chain too without the need for a saw or grinder - assiming you don't want to use it again (the chain that is).
The choices for you are endless..... but if you are going to buy one, get one that will last a lifetime.