8 Inch Professional Quality, Fast Drilling, For Wet/Dry Drilling Concrete, Asphalt, Stone Brick, light Rebar and Hard Masonry. Laser welded  Standard Segment height: 10mm (0.394”) All bits are 17” long to produce 16” core. 1-1/4" - 7 UNC Thread Bits 5/8” to 1-1/2" are threaded for a 5/8"-11 adapter Bits1-3/4”and larger are threaded for a 1 1/4"-7 adapter. Applications: Brick, Concrete Block, Granite, Hard Concrete, Reinforced Concrete, Hard Masonry, Stones, Slate. Equipment: Core Drill or Core Rig