The park tool rt 1 head cup remover makes headset cup removal easy the tool is pulled through the frame until the flared ends snap in behind the cup a blow on the tool head removes the cup park tool rt 1 head cup remover features the professional way to remove headset cups pulls through headtube until the flared end snaps open behind the headset cup simply hammer out the cup safely and neatly fits up to 1 14 inch headtubes and headset cups heat treated alloy steel with