Wolf Tooth 6-Bit Hex Wrench Multi-Tool with Keyring – Green. The new Wolf Tooth 6-Bit Hex Wrench is a slim strong multi-tool with 11 functions for common bike repairs and everyday needs. Six hex bits are stored inside the handles that fit into the end of a ball detent swivel head for use. It is small enough to fit into a riding tool wrap or pocket and has an optional key ring attachment to fit on any keychain for use away from the bike.