3M™ Unitized Wheel Mandrel 932, 2 in x 1/4 in x 13/16 in, 5 per case Use with Unitized Wheels 1-1/2 inch - 2 inch diameter x 1/4 inch - 1/2 inch wide x 1/4 inch center hole. Maximum wheel width is 1/2 inch. Note: 5/16 inch center hole is recommended for wheels 6 density or harder.
3M™ Unitized Wheel Mandrel 990, 1-3/4 in x 1/4 in x 1 in, 5 per case Use with high speed or easy loading Unitized Wheels 2 - 3 in diameter x 1/8 - 1/2 in wide x 3/8 in CH. This mandrel comes with one silver cap for 1/8 in and 1/4 in wide wheels and one black cap for 3/8 in and 1/2 in wide wheels.