Park Tool CNW-2 - Chainring Nut Wrench

Park Tool CNW-2 - Chainring Nut Wrench. - The CNW-2 makes chain ring bolt installation and removal easy - It securely holds the slotted nut to prevent spinning when tightening or loosening the bolt - Double-ended to fit most slotted-type nuts - Made in the USA and covered by Park Tool's legendary limited lifetime warranty The outer width of both ends of the CNW-2 are nominally 12mm wide. One end has a two outer tips nominally 2.7mm wide each, and the other end has tips of 3.8mm each. The blade thickness is nominally 1.35mm.