Used for concrete core drill bits with 1-1/4 in. 7 thread to be extended 12 in. and their multiples. Made with high strength steel. To use with our Longbuddy concrete core bits with 1-1/4 in. 7 thread.
- 1-1/4 in. to 7 in. threads
- Core bit extension at 12 in.
- 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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