Check the listing for details. 2'' /3'' /4''/ 4.7" Set Wet Diamond Core Drill Bit Concrete Brick Drilling Bits. Condition: New. Listed at 70.99 USD. Specifications: Segment height: 10mm Bit Diameter * Bit Length: 51mm (2") x 370mm, 76mm(3") x 370mm, 102mm(4") x 350mm , 120mm(4.7") x 350mm Thread size: M22 Feautres: Excellent choice for all type of general drilling Ideal for plumbers, electricians or general contractors Application: Intended for drilling hard concrete, block, brick, masonry, and the like materials It is suitable for drilling and coring of reinforced concrete, brick wall drilling, air conditioning installation, pipe, road signs drilling, expressway and other outdoor projects. This product is tested, thickness of 220mm cement block, inside four 14mm steel bar, play through about need 4 minutes, can play 40 holes. Hand-held drilling machine need 3-4 minutes to play through the brick wall (only for reference, differe.