Our range of NWL3 coring drill bits are made to the highest quality. Built to last, these Eagle Set to Liner bits are among the most popular bits that are used in the industry. The NWL3 core bits have an overall diameter of 75.7mm or 4 Inches, with a coring (inside) diameter of 47.6mm or 1.87 Inches , allowing for a medium size, rigid core extraction samples.   

The fact that these bits are Set to Liner means the casing string that does not extend to the top of the wellbore, but instead is anchored or suspended from inside the bottom of the previous casing string. Allowing for substantial savings in time and steel.