Tapered Fit, Screw on Pile. Prior to discovering just how good TopHat piles are, these were my own pile of choice. You just taper the shaft and screw them on. No glue is needed. Having used these piles for over 2 years with no glue I didn't have a single one come off in a target. The lack of glue comes in very handy when you plant your arrow into an innocent tree or buried tree root. If it's not possible to easily extract the arrow I simply unscrew the shaft and sacrifice the pile but save the arrow.