#WD-810 FoamWerks Foam Board Hole Drill Set & 3 Drill Tips. .75", .5" and .28" sizes included. Insert the drill tip size that you want into the handle, place the tip over the foam board and screw the handle down driving the cutting tip through the foam board. Leaves a nice clean hole all the way through! Replacement tips are sold as a set under 'FoamWerks Accessories,' Set # WD-4.