Powerbuilt screwdrivers offer the look, feel, and performance hard-working Techs deserve. The 17-Piece Pro Tech Double Injection Screwdriver Set features premium soft-touch double injection polypropylene handles for a sure, comfortable grip. Screwdriver shafts are lightweight and high strength Silicon Vanadium Chrome Magnesium (SVCM). The tips are precision ground, then sandblasted and magnetized. Larger-size drivers include a hex bolster at the top of the shaft, and all sizes are marked on the handle caps for easy size ID and selection. Powerbuilt Professional Technician screwdrivers are built to meet or exceed ANSI standards.