Ridgid 31792 Model R737BB 1-1/2" - 2" Ball Bearing Knockout Kit With Case Hardened alloy steel drive screws equipped with H-D ball bearings provide ease of operation and long life. Features: Precision-ground 3-point punch/die sets. It has a pipe capacity of 2" in 10-gauge mild steel. H-D ball bearing drive screws. Sets include durable ABS storage case. 3 kits availableincluding the deluxe ratchet drive.