Folding Chain Tool - CT-6.3 - from Park Tool USA

This neat little tool works like a heavy workshop tool, but folds compactly for taking on the road or trail. (and because it folds, it keeps the grease away from your clothes)

Features:

• cast steel body
• stainless steel case
• replaceable pin"loosening shelf" for tight links. 
• Weighs just 168g (or 6oz)
• Works on most derailleur chains (including 10-speed chains). 

The CT-6.3 uses the 985-1 replacement pin.

Park Tool Ref: CT-6.3

Before you purchase or use this tool:

Splitting and joining derailleur chains varies slightly based on the brand and model of chain.

Some chains such as current Shimano and Campagnolo models require the use of a special replacement rivet - so don't split the chain unless you have one.

Chains from other manufacturers such as SRAM, KMC and Wipperman use a special "master link" to break and re-fix the chain - I remember when all chains used to be like this!

In these cases the chain tool will only be used for resizing the chain by removing some of the rivets / links.

Some chains use rivets which are partially pressed out (but not all the way) to allow the chain to be separated and then re-used to re-join the chain.

Please refer to your chain manufacturers information for full details.