Magna Industrial Screwdriver Bits are manufactured using a Statistical Process Control. This means bits are monitored through every stage of production to ensure that every bit can stand up to tough industrial condtions. Other tests conducted by our Corporate Engineering Staff are Torque, which measures in inch pounds, the pressure a bit will take before it breaks. While Cycle is the test conducted to show how long a bit will last at a controlled torque and measured by how many screws can be driven by one bit. Magna is the worlds largest manufacturer of screwdriver bits and strives to keep this position by delivering quality bits.