2 Inch Hole Saw: 1.M-42 Bi-metal construction,longer life. 2.Creates sharper,longer lasting teeth, can cut thin stainless steel,mid steel sheet,and wood,plastic,plywood. and also steel tube. 3.Hole saw diameter is 2 inch,the cutting depth is 1.26" (32mm) 4.Operating skills: when drilling,it is better first in low speed, then higher speed.