Crain 188 Hinge ScriberThe hinge scriber is a sheet vinyl seam scriber designed for accuracy, ease of adjustment, and for good grip and control. The offset distance between the bottom guide and the needle is adjusted using a precision thumbwheel. Once adjusted, the three arm knob locks the needle in position. The hinged base allows the tool to be more easily inserted into the seam, particularly on thick material. With the hinge folded open, insert the base under the