Each Tic Tac contains 25 Impact Torsion Pozi Bits. They have a 15 Degree torsion zone that allows the screw driver bit to flex rather than break, and the full fit head prevents rounding of the screw head and prevents 'cam out' (bit head slipping out of the screw head due to the turning force). The magnetic screw lock enables tasks to be completed quicker and easier, reducing instances of dropped or lost screws. 21 x Magnetic Bit Holders. Key features -Each Tic Tac contains 25 Impact Torsion Pozi Bits -15 Degree torsion zone that allows the screwdriver bit to flex rather than break -Magnetic screw lock enables tasks to be completed quicker and easier