For small-hole sizes, ProDrill produces the ODEX Eccentric Overburden Drilling System, rock drill bits starting with the ODEX90 to suit 114mm O.D. casings. This two-piece system comprises the shank bit holder and the eccentric pilot bit that is secured in the bit holder by a double interlocking pin. This is easily removed to allow for bit sharpening or replacement. ProDrill ODEX overburden drilling systems are widely used in a variety of applications from well drilling and mini pilling to rock anchoring and site investigation.
https://www.rock-drill-bits.com/odex-eccentric-casing/odex90-eccentric-casing-drilling-system.html
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