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An ASTQ&A member wanted a 6/10mm tube cutter with a 3mm depth. Litterally cutting the tube in half. 3mm is rather deep so expect to sand it much much shorter. If another depth, or another dual depth cutter in 10mm is desired let me know. Has no internal support as oppposed to the other model, this lets the tube slide in easier.
For best use I HIGHLY recommend dripping silicone oil on the cutting blade and in the slit that is being cut in the material. This prevents static friction from grabbing the rubber and pulling it with the knife, preventing uneven cuts.