SA-5: A cylindrical shape that is 1/2-Inch x 1-Inch in size.
SA-3 is a cylindrical shape that is 3/8-Inch x 3/4-Inch in size.
A cylindrical radius end that is 3/8-Inch by 3/4-Inch is SC 3.
This is the end of the cylinder with a radius of 1/4-Inch by 5/8-Inch: SC-1.
In SD-1, the shape of the ball is 1/4-Inch.
Die Grinder Kit: Astro Pneumatic’s 2181B ONYX comes with a 1/4-Inch Medium Die Grinder and an 8pc. Double Cut Carbide Rotary Burr Set. You can control how far the blades move with a lever. The handle is ribbed for a firm grip. The blades have a rear exhaust air flow system that moves air away from the work surface. In addition, the bigger motor gives more power to make it easier to finish the job.
Works great and is very quiet. The case it came in is the same as all the other plastic cases, and there is a lot to be desired about it. The carbides work well and so far have held up well. They were a good buy at a good price point, and I would buy them again.
