Gilson CDA-143 4.25in Concrete Core Drill Bit (Closed-Head)

Gilson Concrete Diamond Core Drill Bits CDA-143 4.25in (108mm) Concrete Core Drill Bit (Closed-Head) is for use with Gasoline or Electric-Powered Core Drilling Machines to obtain drilled cores of hardened concrete or asphalt. The core bit has one-piece seamless construction and easily attaches directly to the drilling machine; it works best in light to medium-duty applications. Diamond Coring Bits are designed for wet-use and offer solid performance for recovering cores from reinforced concrete and similar hard materials. Capable of fast-cutting when used in applications indicated. The bit has a standard 14in (356mm) length that allows for cutting cores up to 12in (305mm) long. The coring bit can be refurbished when it appears worn. Final core diameter is approximately 0.25in (6.4mm) smaller than nominal outside diameter. Features: Fast-cutting when used as specification indicates; Quickly attaches to drill machine; Complies with ASTM and AASHTO standards; Included Items: 4.25in Concrete Core Drill Bit (Closed-Head) Specifications Application: Concrete; Nominal Bit Size OD: 4-1/4in (108mm); Mounting Connection: Closed-Head; Estimated Shipping Weight: 8.0lb (3.63kg); Meets Standard(s): AASHTO T 24M/T 24; ASTM C42/42M;