Outer diameter: 43 mm, inner diameter: 38.1 mm (1.5")
If you need to attach a US standard drill with a clamping neck of 1.5" (Ø 38mm instead of 43mm = EU standard), place our steel adapter ring (with light spring action) in the 43mm Euronorm bore of the system jaw and clamp your drill with 38mm clamping neck. Tighten well!
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