FeaturesSatin chrome plated and black finish tipsColour coded to easily verify sizesNickel chrome molybdenum alloy steelSet of 6 nut driversSizes: 3.2 x 75mm, 4.0 x 75mm, 5.0 x 75mm, 5.5 x 75mm, 6.0 x 75mm & 7.0 x 75mmThis Modelcraft 6 Piece Nut Drivers Set will be particularly useful for tightening nuts and bolts. They have a hollow shaft to run a nut a long way into a bolt, with the excess length of the bolt going up inside the shaft. Can be used for various tasks especially electronics and bicycles/motors.