Mafer + Pin (Part# 541004) by Matthews: Strengthened to withstand greater clamping pressure than any other clamp of its kind it can now be effective in even more uses. The protective pads in the jaws have been reformulated for better gripping action. Because of its superior strength several new attachments have been added. Comes with a snap-in pin. To purchase separately, the Mafer Clamp can be found under part number 540004, and the snap in pin can be found under part number 209632.