Securely grips all round and works on fasteners with up to 85 % damaged or worn corners - Works on a range of fasteners e.g. 6-point, 12-point, Hex, Spline - Adapts just two Socketes/Ring spanners sizes to fit 10 different fasteners (sizes 8-17 mm) - 8-12 mm Inserts suit 14 mm Wrench - 12-17 mm Inserts suit 19 mm Wrench - Unique flange design to prevent fall through - Adapters for fixings sized 8, 9, 10, 11, 12, 13, 14, 15, 16 and 17 mm