The connection is used for drilling with diamond and widia core cutters in mineral materials (for electrical boxes up to a diameter of 90 mm, using a vacuum cleaner).
vacuum cleaner connection: 29 – 36 mm
max. chisel / crown size: 90 mm
MAX DIAMETER FOR CORE DRILL BIT 90MM; FOR VACUUM PIPE 26-39MM; SUCTION ABILITY TO WALL THANKS TO RUBBER SEAL