This is a heavy duty BD mounted double tom set up. Uses standard 10.5mm L arms. Includes bottom base mount 1in dia. down tube going up to hold two toms on the OmniBall L-arms. NOTE we can custom build one of these with other diameter L arms - (example 12.7mm or 9.5mm to fit other drum co brackets ) Call us about this special request if needed. NOTE - Actual item may vary from the shown photo.