Heat treated steel bushings. The sizing diameters are hand polished with a surface hardness of Rc 60-62 to reduce sizing effort. Bushings are available throughout the range of .185" thru .368" in .001" increments. The last three digits of the part (#RD73XXX) denotes bushing size. View other sizes: .185" to .250" .251" to .305" .306 to .368" Mfg: Redding
