The Aceline BFD0120 bit set contains 2 PH-type bits designed for tightening and loosening small fasteners. The bits are attached to the chuck of a hand or power tool via hexagonal shanks. The attachments can be used with screwdrivers, impact drivers, or drill-drivers. \nThe 50 mm single-ended bits in the Aceline BFD0120 set are made of steel. These fastening tools feature magnetic tips to hold small bolts and screws securely. They are supplied in a transparent blister pack.