Draper expert 8 piece engineers or mechanics screwdriver set draper expert 56772 b i expert quality i b chrome vanadium steel blades hardened tempered and satin chrome plated finish with sand blasted tips the handle is manufactured from impact resistant heavy duty soft grip polypropylene with colour coded handles for easy recognition some blades have hexagon bolsters which enable extra power to be obtained by use of a spanner packed in tray with plastic insert br br b b br