28781 is a 20 piece insulated TorqueControl and SlimLine blade set. It handles is the standard for premium quality featuring ergonomic cushion grip handles for comfort and control, dual durometer construction for long-lasting durability, handles directly molded for a permanent bond, and include parallel flats for roll-off prevention. It features an audible and perceptible click for alerting users the desired torque limit is attained with a torque accuracy of +/- 6% for confidence in precise tolerances. It consists of Wiha premium quality tool steel for strength and durability and have exact fit precision machined tips for reduced cam-out. Each blade has a black oxide finish for corrosion protection and direct molded insulation for protection against electrical shock and arc flash explosion and features 33% narrower blade shafts for reaching deep set fasteners.