Prestacycle perfects and simplifies handheld torque tools. Our Pro torque key uses intelligent design and a balanced two-spring mechanism for the highest possible accuracy without the need for expensive calibration. Our shaft has 50% thicker walls than other Torque Driver tools for strength to use as an everyday tool. Ergonomic four Finger Grip makes wrenching easier. Gives an unmistakable 20 degree overrun when Torque limit is reached. Standard Magnetic Hex Tip works with all our Bicycle Bits sets and any other 1/4? Hex bits.