Fits in a 1/4in router colletEnables you to cut thicker materialsMaximum cutting depth: 1/4 in. (6.3mm)Minimum cut radius in materials thinner than 1/8 in. (3.1 mm): 1/8 .in (3.1mm)Minimum cut radius in materials over 1/8 in. (3.1mm) thick: equals materia..