This is the replacement Outer Shaft Collar for / the Heli-Max Axe CX (HMXE09**). / / FEATURES: Aluminum construction / Silver in color / / INCLUDES: One Aluminum Outer Shaft Collar with Set Screw / / REQUIRES: Installation / / SPECS: Diameter- / Inner: 3mm (.11") / Outer: 5mm (.19") / Thickness: 2mm (.07")