Abracs SDMBH2 Impact Magnetic Bit Holders 50mm (Pack Of 2) The Abracs SDMBH2 is a Pack of 2 Impact Magnetic 50mm long Bit Holders with 1/4 inch shanks. Manufactured from S2 Premium Steel for a long life and suitable for all heavy-duty screw driving applications. Features: Premium construction S2 steel Strong magnet Quick change Long life Heavy-duty Specification: Quantity: 2 Part number: SDMBH2 Length: 50mm Shank: 1/4in Hex