The JIECHENG 1-1/4-inch diamond hole saw set is designed for making 32mm openings in porcelain tile, ceramic tile, marble, and granite during bathroom remodeling, kitchen installation, plumbing, sink fitting, shower hardware installation, and similar projects. The set includes two 1-1/4-inch diamond hole saws, one removable center pilot drill bit, and one hex wrench. The pilot bit helps position the cutter and improve control at the beginning of the hole, while the included wrench makes pilot bit installation, adjustment, and removal straightforward. The 2-pack configuration provides an additional cutter for extended work or backup use, helping reduce interruptions during multi-hole projects. The hole saws are compatible with common handheld electric drills equipped with 3/8-inch or 1/2-inch drill chucks. Not intended for drilling wood or plastic.