The Remington Powerdriver Models 489 and 490 are designed for use with Remington powder 22 caliber Type A neck-down crimped loads and Remington Power Fasteners which are no longer than 2 1 /2" or power washer fasteners no longer than 3". Remington Power Fasteners are manufactured from special steel and heat treated to produce a very hard yet ductile fastener.
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