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- 1/2 of shoe heat treated to 48-54 Rockwell “C” - hardness tested
- Highest quality seamless steel tube (to A.P.I. specs)
- Concentric machining assures straight setting in well
- Inside bevel on cable styled shoes radiused to allow drilling tools to be easily pulled back through shoe
- Zinc phosphate coated and painted to enhance appearance and corrosion-resistance
- Lead Free: ≤ .025% Lead Content
- MaterialSteelManufacturerMaass MidwestManufacturer #941318Nominal Size4 inSeries421W