Ring clearance is designed for better access to recessed or closely spaced fastenings and the 12-point OGV® profile of the 15º angled ring head allows for a high torque without damaging the nut. The FCM44028 Combination Spanner has the following specifications.
Got the set, amazing spanners, beat the old design of spanners. Comfortable, light and strong, what more do you need from a spanner.
The OGV helps these work on A/F sizes as well to a fashion, so never needed two sets of spanners. Never damaged a fixing, no matter its age and condition, and able to apply more torque.
These are generally shorter than other brands, but allows for easier access. I bought the Facom 40.##LA spanners for more grunt on M12 and upwards.