Easy to operate the glass cutter device, round blade and tweezers according to small glass tubes The glass cutter can be used for both educational and personal use, but should be cautious when using it to avoid cutting yourself. If the head is worn out, you need to replace it so it will not affect use Both borosilicate glass and flint glass will scratch and break quite quite well Material: Zinc Alloy Dimension: 6.5x7cm/2.56x2.76"(approx), Manufacturer: Fcnjsao