1、High Carbon Steel Material: This emery hole saw bit is made of excellent high carbon steel, no beveling and bit is with incisive drilling. 2、Applicable Materials: This hole saw bit is suitable for glass, tile, marble, glass tile, all kinds of hard stone. 3、Hole Opening Size: Our hole saw bit has an opening size of 35mm(4in), light overall weight and easy to install. 4、High Temperature Quenching Process: the hole saw bit has small resistance to cut, neatly open the hole without easy to break the edge, and high efficiency of opening the hole. 5、Fast and Convenient: Our emery hole saw bit is very fast and convenient to use. And the bit is robust and not easy to wear. 1 x Emery Hole Saw Drill Bit Item Type: Brazing Opener BitMaterial: High carbon steel, emeryBasic ParametersHole Opening Size: 35mm / 1.4in