Cimco round knock-out punch and die set for PG16 openings, cutting a 22.5 mm hole in steel plate up to 2.0 mm thick (ST 37). Requires a 10.0 mm pilot hole and is driven by a 9.5 x 50 mm draw bolt suitable for hydraulic or mechanical actuation. Used to prepare cable-gland openings in switchgear enclosures, control cabinets and junction boxes.