Assertion: roller skate's wheel | /r/CapableOf | lock on obstacle
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Source sentences:
text: a grinding area flush with the soul plate, near the middle of the boot, used for grinding on the boot H-Block area on frame between inner wheels that locks on obstacle and grinds Wheels two to four polyurethane wheels with bearings Anti-rocker wheels the two inner wheels smaller diameter made of plastic or hard urethane placed in the middle of frame, installed to make grinds easier on wider surfaces.