Buy the specification behind the accessory.
Does S2 or S3 alone prove a longer service life?
No. Steel grade is one part of the specification. Geometry, heat treatment, hardness, fit and the actual working conditions also matter. GEAKITA does not claim a service-life multiplier without a corresponding test.
Are all bits, sockets and extensions impact-rated?
No blanket impact rating is implied. Specify the exact tool and operating mode, then select rated components. Flexible extensions and ordinary sockets must not be assumed suitable for impact use.
Can every disc fit a GEAKITA angle grinder?
No. Match diameter, bore, maximum operating speed, guard and intended operation. A 22.23 mm bore does not automatically fit a 16 mm or 20 mm interface. Wet-use accessories also require a suitable machine and working method.
Can mixed sets use an upgraded steel grade?
Specify the material for each component in your OEM brief. Mixed sets may contain different grades; an S2 designation should identify the applicable components.