The Jameson pole saw head with male adapter is well made and is a lightweight pole saw head of cast and extruded aluminum. Male ferrule fits most poles using the exterior leaf spring with locking button system on aluminum ferrules. Outside diameter of male ferrule is 1.25 inches. Use the PS3FP to mount any pole saw blade with "universal" center bolt + pin mounting system. Will accomodate blades from Jameson, Barnel and some Snap-Cut and ARS blades. Check out our other Great Garden Supply products