Answer
Dec 10, 2025 - 06:18 AM
Hello. Thank you for your question.
The D1 measurement is the bearing which is 5/8.
There are two 1/2" measurements with this tool. The R for radius and the d for the shank size.

The D1 measurement is the bearing which is 5/8.
There are two 1/2" measurements with this tool. The R for radius and the d for the shank size.

