| 摘要 |
A rotatable cutting tool of the type having a bored tool holder, a cutting bit comprising a shank depending from a head portion with first forward and second rearward retaining portions spaced by a recessed intermediate section includes a cylindrical split sleeve member which extends from said forward retaining portion to said rearward portion to both abut and protect the exposed peripheries of the retaining portions from wear while permitting free rotation of the tool bit within the tool holder.
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