Craftsman 5 pc. Precision Bi-Material Screwdriver Sets has a black oxide coating that provides a more precise fit and reduced fastener stripping and cam-out. The polypropylene material, and ergonomic shape of the handle offers twisting force for three different applications; a speed-zone for quick rotation, a torque-zone for added grip in heavy torque applications, and a precision tactile zone for tasks requiring more rotation.. See full description for further details