Ceta Form New T90 Ratcheting Bit Drivers. For high speed and accurate screwdriving. This new series, available in both stubby and full size versions, feature a very robust ratchet mechanism. This mechanism allows for a return angle as low as 8°. Moreover it can stand up to a torque level of 50 Nm. T90 Ratcheting Bit Driver (Stubby)has an ultra smooth ratcheting action thanks to fine gears, compact sizes for confined spaces.