Posted August 24, 2022Updated August 24, 2022LUBRICATION KEY IN USEThis is an amazing drill. I have drilled over 50 holes in glass blocks. I actually submerged the blocks in water while drilling with a drill press. I think lubrication is key when using this bit. Ps installed miniature lanterns in blocks.ProsProduct Name: Hole Saw; Material: MetalConsSome bugs 0 0 0