The Crystaline screwdrivers feature an extruded warp-resistant, hexagonal cross section grip. By combining clear resin with colored resin we have created a colorful grip with a crystal sparkle. Cellulose acetate resin, used in many plastic screwdrivers, is an ecologically friendly plant-based polyester resin. Best suited for metal/machine screw applications such as automotive maintenance, office equipment repair, electronic assembly, or for general use. Also, the cross-point tip models are recommended when working with JIS (Japanese Industrial Standard)screws.