It's a 300 but thanks for the extra info.out side needs to be 1 1/2 x 1 1/2, then you will need to round down the very corners just a tad. what are you working on ?. if its a trx500 or larger ?, this won't work. only works on trx250's, trx300's, trx400's, and trx450's. anything above a trx450 won't work.
What's the blind hole bearing puller for? Is it to remove the little pinion bearing?88-00 Honda TRX 300 Fourtrax 60mm Differential Pinion Bearing Nut Socket Tool | eBay
Honda ATV Pinion Bearing Nut Tool 60mm TRX 250,300,350 Fourtrax Differential | eBay
Honda TRX 300 TRX 250 TRX350 Fourtrax Differential Pinion Bearing Nut Tool 60mm | eBay
I just buy the proper tools as needed. I don't have the time or patience to dick around trying to cobble together stuff when I can buy the proper tool for less than $50. Might was well order a blind hole bearing puller while your at it....