Gilson's Concrete Diamond Coring Bits are available in two styles open or closed-head, both designs are optimized for reinforced concrete and other hard materials. All bits are constructed for wet use and are fast-cutting when used according to design applications. The standard length is 14in (356mm) for cutting cores up to 12in long. Looking for bits specific for coring asphalt? See Asphalt Core Drill Bits.
Open-Head is less expensive and is the economical choice for high-output and heavy use applications. However, expander sets are required for Open-Head bits. When choosing a drill bit that is more typical in lightweight work applications, Closed-Head Bits are the best option.