Standard (KWN) 0-1/2” Grip Wing-Nut Cleco Fastener Sets. The wing-nut standard (KWN) series is a hand operated clamp with a wide range of grip force. It is best suited for low-production settings where additional tools (pliers, wrenches, ratchets, etc.) are not required. This allows for application in areas with limited space. The ‘free-wheeling’ wing-nut is easy to grip and will back completely off while still remaining intact with the body. Clamping force ranges from 12-300 lbs making it suitable for all types of metallic and composite materials.