a taping knife which includes a blade with an elongated handle secured to the blade . the plastic handle includes a durable inner member and a grippable outer core . the hollow inner member is formed from adjoining member halves which have an inner structural support network of ribs . the handle component parts sealably interlock and are secured together upon formation of the outer grippable core whose material flows into certain ribbed network compartments and secures the interlocking parts together .