One end has an open head, and the other has a 12-point ring head, which is set at a 15 degree angle to increase ease of access to the fastening. Manufactured to DIN3113A standards. The 12 piece set contains the following spanner sizes: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm and 19mm.
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