Milwaukee Screwdriving Magnetic Nut Drivers are manufactured from engineered steel that has been heat treated to provide maximum strength and extreme durability. The strong magnetic tip provides a secure grip. Reception: 1/4in Hex that conforms to DIN 3126-E 6.3, making them suitable for high impact and high torque applications. Length: 65mm.Milwaukee Screwdriving Magnetic Nut Drive Size: 8mm x 65mm.For anchor rod size: M5. Pack Quantity: 1.