The 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. - Fits 1", 1-1/8" and 1-1/4" headsets - Strong, heat treated alloy steel with nickel finish The RT-1 will also remove the PressFit 30 (PF30) bottom bracket units. The PressFit 30 inside diameter is the same as headset cups, and are pressed in the same manner. SHIS terminology: Removes cups of EC29, EC30, EC34, EC44, ZS41, and ZS44