RotoZip XBIT Multipurpose Tracing Bits for the Bosch Rotozip RZ3 Saw (Quote 74031). For cutting various materials, including soft wood, chipboard and plastic. Cut-outs can be made without measuring. Patented tip design leaves the object behind the workpiece uncut, using the frame of the workpiece as a template for the cut to ensure perfect cuts every time. Specifications: Shank and working diameter 4mm.