Improved design firmly holds work fl at on a machine bed or in a vise 4" (100mm) Length, 27/32" (21mm) Width.FEATURES Improved design firmly holds work fl at on a machine bed or in a vise Contact edges are tapered to hold work securely and force it downward to the bed of the machine or against any parallel surface Especially useful for holding small work or thin materials without distortion Made of tool steel, hardened and ground