Du-All Art & Drafting Supply

36" x 1-1/2"Aluminum Potters Rule.For potters,ceramicists and others working with processes where shrinkage occurs at a known rate.Allows the creation of accurate scale plans and templates without tedious calculating or guess work.Calibrated two edges both sides.1st side standard inch 1/8 shrinkage 2nd side 1/10,1/12shrinkage.