Hole Saw 105mm (4 1/8")105mm Built In Arbor Hole Saw 4 1 8 Inch Fully welded design for strength and stability Designed for professional trade use where durability and cutting stability are critical, this hole saw features a fully welded built in arbor that eliminates loosening during use and improves overall cutting performance. The extra thick 5. 5mm back plate provides added rigidity, reducing warping and helping maintain a smooth, controlled cut. The rigid construction