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) : 32
Input Drive (mm) : 12.7
Total Length (mm) : 85
Compatible C-ring : PK1401C (across-flat 8 to 14mm), PK1402C (across-flat 15 to 41mm)