1/4"?
inside hexagon,
DIN 3126/ISO 1173 D 6.3
Outer 10 mm for use in tools with 10 mm internal hex drive or
internal double hexagon (e.g. "FLEXI" double-ended flexi-joint
spanners, T-handle universal joint spanners, box spanners, ratchet ring
spanners etc.).
Internal hex drive with a collar-thrust spring (registered design).
Bits are easy to insert, lock securely in position and can be removed
just as easily; even hex bits with a wide groove (Type E, DIN 3126/ISO
1173).
HPQ high performance steel.
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