Air Operated File This air powered filer gives the user increased control over hand filing. Perfect for enlarging holes, cleaning up edges, and smoothing metal work before painting. Requires 4 cfm at 90 p.s.i.. Delivers 9000 strokes 1/4in. long per minute. Includes four 4in. file blades (flat,round,triangular and bastard cut). Limited one year manufacturer's warranty. Imported.