Fuller Type R Counterbores have two flutes to cut a flat bottom hole in wood or plastics for heads of screws, rivets, or nails. Extension lip pattern cutting edges cuts a clean hole without tearing the wood. These stainless steel bores are hardened enough to hold an edge and yet can be sharpened with a file.

Tech Specs

Part Number	Cutting Diameter	Drill Size
R17	3/8	7/64
R1	3/8	1/8
R19	3/8	9/64
R15	3/8	5/32
R111	3/8	11/64
R13	3/8	3/16
R113	3/8	13/64
R72	7/16	1/8
R75	7/16	5/32
R73	7/16	3/16
R713	7/16	13/64
R22	1/2	1/8
R25	1/2	5/32
R211	1/2	11/64
R23	1/2	3/16
R213	1/2	13/64
R27	1/2	7/32
R215	1/2	15/64
R24	1/2	1/4
R93	9/16	7/32
R97	9/16	7/32
R94	9/16	1/4

Reviews for Type R Counterbores

1 of 1 Reviews

October 7, 2009

Okay, but not so great for pine

By Pastor B from Ellsworth, Maine

As a church we are setting up so that people can build their own interior storm windows, double-glazed with heat-shrink plastic. As of yet, have not found an acceptable counterbore for the pine we are using for frame stock. What is needed is a counterbore that cuts like a forstner bit so that the wood has a place to go, it just loads up in these, and then you have to go at it several times with the drill press. I think these are as good as they can be, of this design.

Bottom Line No, I would not recommend to a friend

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