This PROXXON screwdriver set has an Ergonomic design which, allows for excellent handling and ease of use. The handle is made up of two components and has the FLEX-DOT' nubs for comfortable continuous use. The handle is also oil and acid resistant and is made up of a non-stick rubber. These screwdrivers have a processed black tip giving you greater precision for accepting screws and eliminate the tool from slipping. Sizes include: 3, 4, 5.5, and 6.5mm flat head & PH 1 and PH2 screwdrivers.