- Drop forged alloy steel, natural finish (Armstrong holders meet federal spec. A-A-51137a)
- For use with standar high speed tools bits-accurately machined and carefully hea treated, these tool holders feature a relieved cutter bit hole to assure proper seating of tool bits, thereby reducing breakage.
- Set screws are made from alloy steel and have hardened points-turning tool holders are furnished with wrench.
 
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