In addition to the opening (hexagonal)which comes in contact with bolt/nut, surface contact flat drive that reliably passes high torque without damaging corners is being employed to the square drive unit on the insertion side.
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Opposite Side Dimension (mm) : 36
Input Drive (mm) : 19.0
Total Length (mm) : 55
Compatible C-ring : PK1600C (across-flat 17 to 46mm), PK1801C (across-flat 50 to 60mm)