Super Plus Quality Diamond Core Drill Bits For Concrete Blocks Bricks Asphalt Masonry Wet Use. Available sizes: 5/8" to 24" Super plus quality, fastdrilling wet diamond core drill bits offers the best lifetime. Laser welded. Segment height 0.400". 17" Length to produce 14" deep core. Wet use. Threads: 5/8"-11" or 1-1/4"-7" Core bits diameters from 5/8" to 1-5/8" have 5/8"-11" thread connection Core Bits diameters form 1-3/4" to 20" have 1-1/4"-7" thread connection Materials and applications: Industrial-grade diamond water drill is widely used in many fields. Concrete, Masonry, Blocks, etc. Hard Sandstone, Coarse Sandstone Breeze Block & Soft Slate Equipment: Hand-held core drills or core drill rigs