Acrylic & Chipboard For All Solid Kitchen Worktops Jig (L)1m (W)1m (T)12mm. This Acrylic & chipboard jig is suitable for the For all solid kitchen worktops. It measures 1m by 1m by 600mm & is used when you need to cut out a hole for an undermount sink in your kitchen worktop ideal for a perfect accurate cut out.