Size: 16mm, 17mm. Open End Angled at 15-degree on each end allows an increased range of arc swings in narrow spaces. Two sizes per wrench make it more versatile. Size: 16mm x 17mm. 15° Angled Open End: Provide you with an extra working swing arc when working in a narrow space, and can be flipped over for each rotation so that the fastener engages twice.
eBay