You are asking about 2 different things. The L arm on the DW stands is 12.7 mm dia. This is the size that DW and Gretsch use. The rest of the world uses 10.5 mm. You can buy the L arms at the Guitar Center or get a larger tom mount to fit the 12.7 L arm.
The RIMS mount allows the shell to vibrate freely when struck providing more sustain.
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