The off-set attachment permits working near edges and walls. The dimension across corners is 11.2 mm, The attachment can be adjusted in 12 different positions, Lockable 1/4" universal bit holder for all standard screwdriver bits, Suitable for all Metabo L and PowerMaxx "Quick" machines, Suitable for Metabo PowerMaxx BS Quick, PowerMaxx BS 12 Q, PowerMaxx BS 12 BL Q, BS 18 Quick, BS 18 L BL Q