Wiha 28393 Insulated Slim Line Precision Pop Up Screwdriver Set, Slotted, 7-Piece Firmly squeeze tabs to pop up bit chamber Rotating cap allows palm pressure during while driving screws,Full blade exposure for fast, easy access It is a friction fit O-ring design. SlimLine blades have up to 33% narrower insulation diameter than standard insulated tools Wiha SoftFinish handle, multi-component, cushion grip