Bi-Metal Hole Saw Kit, HYCHIKA 17 Pcs High Speed Steel 3/4" to 2-1/2" Hole Saw Set in Case with Mandrels, Hole Saw Bit, Hole Saw for Thin Metal, Hard Wood, Drilling PVC Board, and Plastic Plate ...
There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and annular cutters. 1. Twist drill bits. Especially in steel thicker than ¼", ...