Abstract: An apparatus for deburring the marginal edge of a cylindrical body, comprising a substantially enclosed cylindrical housing having (i) a circular hub, (ii) a continuous, open channel circumscribing the hub, and (iii) a circumferential rim disposed radially from the channel. The channel has (i) an inner sidewall defining the outer wall of the hub and an outer sidewall defining the inner wall of the rim, and (ii) a laterally disposed annular boss interconnecting inner and outer sidewalls so as to connect the hub and rim. A plurality of first, spaced elongated slots and second, spaced elongated slots are formed at opposed peripheries of the boss, and the first slots open through a portion of the inner sidewall and the second slots open through a portion of the outer sidewall; and the first slots are offset from the second slots and disposed radially outwardly from the first slots.