Draper expert 16 piece engineers screwdriver set draper expert 43571 b i expert quality i b professional screwdrivers have chrome vanadium steel blades hardened tempered with satin chrome plated finish and sand blasted tips the generous size handle is manufactured from high quality transparent pvc colour coded handles for easy recognition some blades have hexagon bolsters which enable extra power to be applied by use of an open end spanner packed in blow mould case with sleeve br