here this will save you the looking :
link to page : http://www.caswellplating.com/buffs/bench_mandrels.htm


PROD MAND22 Bench Mandrel 1/2" Shaft $31.00
PROD MAND21 Bench Mandrel 5/8" Shaft $31.00

Attach these mandrels to an electric motor with a V Belt to make a HIGH QUALITY, low cost work station for various sanding, polishing and buffing operations. Will run wheels up to 1" thick.

Features high quality precision grade die cast ball bearing pillow blocks, permanently sealed and lubricated. Threaded shaft ends L/H & R/H

2" diam V pulley (for 1/2 belts) & hex nuts with flanged washers for shaft ends.

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http://www.caswellplating.com/buffs/shaft.htm

that is what i got on this motor ... the left side is std siz. the right side is extended