【Package Includes】Total 10pcs Carbide drill bits:2pcs of each 1/4",1/4",5/16",3/8",1/2"(6/6/8/10/12mm);Thread:Quick-fit Shank;Recommended 2000-5000 RPM,MAX 5000 RPM. The faster the speed, the longer the service life.Great gift for father's day ,christmas and birthday 【Quality Material】Industrial-grade tungsten carbide welded drill tip, good wear resistance, widely applicable; high-strength steel substrate, growth of service life. 【Head cross design】Precise cross head design can reduce the drill bit slipping and walking, is more stable drilling, easy to operate; head with spiral groove, easy to discharge chips; 【Wide Compatibility】Can be used for drilling and pre-drilling positioning, making drilling more accurate；Suitable for use with ordinary hand drills, table drills and rechargeable drills and other types of machines. DO NOT use impact or hammer mode! 【Multiple Application】Suitable for dry drilling wood, plastic (PVC pipe), foam tiles, antique tiles, glazed tiles, red bricks, cement, concrete (need to avoid steel reinforcement) , ect; Materials to be drilled with water or coolant (harder materials): glass tiles, full ceramic tiles, ceramics, marble, glass, etc; BeQell Masonry Diamond Drill Bits,10pcs 1/4"-1/2" Concrete Diamond Hole Saw Kit for Wood Plastic Brick Ceramic Tile,Carbide Tips Quick Change Shank Core Drill Bit Great gift for father's day ,christmas and birthday