Klein Tools 31670SEN Hole Saw Arbor with Pins, 7/16-Inch Pins lock the saw to prevent over-tightening 118Degree split point pilot bit Use with Klein hole saws: 1-1/4'' (32 mm) - 6-7/8'' (175 mm) Set pilot drill point 1/8'' (3 mm) beyond tooth points Hardened mandrels