Step wrench in sizes 3/8" (9.6 mm) / 29/68" (11.6 mm) / 1/2" (12.6 mm) / 21/32" (16.4 mm) / 27/32" (21 mm) with 1/2" drive, made of high-quality CRV steel. It has a cut on both sides intended for screw connections with protrusions.

The stepped screw wrench is used for assembly:

The step wrench is used for the assembly of: - external threaded connectors (nipples) - heating valves - lower shut-offs on radiator returns - valve extensions