Chigiriki (3.5e Equipment)
From D&D Wiki
A chigiriki is a ninja weapon consisting of a staff (generally as long as the user's arm) with a chain and weight attached to the end. It is like a cross between a flail and a kusarigama. With it you receive a +2 bonus on attack rolls to disarm an opponent. Additionally a ranged touch attack may be made to initiate a grapple without provoking AoO. Finally due to the staffs design it has a compartment which can hide tools, chemicals or even small weapons granting a +2 to Sleight of Hand checks to hide the contents or to draw them.