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The underside of the knob GN 5337.4 is not recessed or hollowed. This means that if they are fitted with a stainless steel bushing they will meet the standards and requirements...
The hand knobs GN 6335.4 have an immaculate contact or clamping surface thanks to the protruding steel bushing.
Due to the shape of the three-lobed knobs GN 5330.5, higher torque can be achieved. The material is able to withstand relatively high impact.