Diamond Core Drill Bits Super+ Quality Cutting Concrete Asphalt Bricks Blocks Professional quality laser welded dry diamond core bits offers the best lifetime available on market. Laser wielded. Segment height 0.400”. Length: 11" long to produce 10" core. 5/8"-11" thread. Materials and applications: Industrial-grade diamond dry 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