Milwaukee® Service Armature is designed for 6520-21 1 1/8", 6537-55 1 1/4", 6536-21 1 1/4" stroke Sawzall®, 6523-21, 6523-55 Sawzall® with rotating handle, 6520-21 1 1/8" stroke double insulated Sawzall® 6523-69 OEM Equalizer® with rotating handle and 6520-21 12 A orbital Sawzall® recip saw.