Woodtek 160289, Clamps And Vises, Bar & Pipe Clamps, 12" One Hand Bar Clamp These clamps are like an extra hand for positioning or fastening. Specifications: Throat Depth=2-1/2 in, Max Opening=12 in, Length=21 in Specifications: Width=9 in, Height=1 in, Jaw Width=1-3/8 in Specifications: Jaw Height=3-3/8 in