This 11mm bi-hex driver is essential for fixing cladding and roofing screws on modern commercial buildings. Fitted with internal circlip for extra grip Specially designed for use on fixings with plastic coated heads, the driver fits a standard drill driver using the Quick-Chuck method or can be fitted into a 3 jaw chuck. Internal circlip for extra grip. 11mm Bi-Hex for cladding & roofing tech screws with moulded caps. Non magnetic 65mm length