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Cup point set screws have a concave indentation at one end.
The cupped edge of the concave helps secure the set screw into place by digging to the contact surface material.
This point style also helps prevent loosening from vibration.
A4 Stainless CUP POINT
DIN 438 / ISO 7436
A2 Stainless CUP POINT
Stainless Steel
DIN 438 Cup Point
A4 Stainless Steel
ISO 4029 / DIN 916
A2 Stainless Steel