multi-functional ceramic boor brick glass hole open wall drilling tool overlord handle drilling

characteristics: 1. material: the product is made of high hardness alloy, which is durable and durable. 2. sharp head: using special sharp strengthening technology, the incision resistance is small, the hardness is high, and the opening is sharp there. three. spiral design: it approves high-efficiency spiral design, which can practically remove chips and make drilling more smooth. description: this product is suitable for use with hand drilling and bench drilling for openings i