![A scrimshaw whalebone crimper [pie crimper or jagging wheel] with whale ivory double wheels](http://www.prices4antiques.com/item_images/medium/68/55/63-01.jpg "Sailor Craftwork; Pie Crimper, Whalebone & Ivory, Pillared Handle, Double Wheel, Fork, 7 inch.")
A jagging wheel, also sometimes known as a pie crimp or a pie crimper, is a fluted or crenellated wheel used to trim and/or to seal the edges of pastry crusts. They were also some of the most common items produced from ivory by whalers who practiced the arts of ivory carving and scrimshaw in their spare time on long sea voyages. (Iron and wooden jagging wheels also occasionally appear on the market, but the vast majority of them are ivory or bone.) More elaborate examples have pierced carvings throughout the handle and the wheel and it is not at all uncommon for the design to incorporate a fork either on the handle or diverging from the handle above the wheel for pricking vents in pastry.
