5/16" ID spindles fit Motors: ARBE Mini
3/8" ID spindles fit Motors: Baldor #16 and Baldor #25
1/2" ID spindles fit Motors: ARBE 1/2HP and Quatro
5/8" ID spindles fit Motors: #15 and Baldor #29-1
Internally threaded spindles fit Motors: Baldor #50 and Baldor #75
Warning: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. - www.p65warnings.ca.gov