Used for concrete core drill bits with 1-1/4 in. 7 thread to be extended 6 inch and its multiples. Durable metal body is heat treated to increase strength and also rust proof. Center hole is designed to use with center water fed drilling machines.
- 1-1/4 in. to 7 in.
- Core bit extension
- Can fit concrete diamond core bits with 1-1/4-7 thread
- Can fit our concrete core bits with diameters from 1-5/8 in. up to 16 in.









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