The stanley tools fat max flared tip bolster screwdrivers are colour coded and feature icon id for quick recognition of tip pattern and size they have a chrome vanadium steel bar that resists bending and snapping the tips have been hardened for durability and precision machined for excellent head to fastener fit they are fitted with a tri material handle the inner core is moulded directly to the blade tang and then a polyprop outer with a tpr overlay for grip and comfort this large diameter hand