BGTEC Diamond Core Drill Bits Set 7pcs(20/35/40/50/68mm Hole Saw Drill+20mm Finger Bit+Hex Shank Adapter) with M14 Thread for Porcelain Ceramic Tile Granite Marble Masonry Stone

【Specifications】7pcs:5pcs 20/35/40/40/50/68mm Drills+1pc 20mm finger drill bit +1pc hex shank adapter.One set can meet the needs of drilling, reaming and chamfering; 【Wide range of applicable performance】We provide a variety of specifications of drill bits to meet the needs of different materials, can be widely used in marble, granite, tile,quartz and other materials cutting. 【Applicable machines】Applicable to angle grinders. Use the adapter can be used on hand drill. Can be used wet or dry; 【Tip technology】U-groove tooth shape adoption,fast removal,less chipping,less heat. Vacuum brazed diamond technology, stronger and more wear-resistant than galvanized diamond drill bits,offers very high efficiency; 【High Quality Material Selection】We choose high quality diamond raw material and steel matrix to manufacture the drill bits, and the top of the drill bit is made of high grade diamond sand, which is tightly arranged and scientifically proportioned to ensure the high hardness and denseness.