Ridgid 24587 HKO1810 1/2-inch to 4-inch Hydraulic Knockout This item is KNOCKOUT, HYD 1/2-4 HKO1810 24587 This product is used for tools-replacement-parts This product manufacture by Japan 12-inch to 4-inch Hydraulic Knockout Kit Equipped with a hand pump Weighs 61-1/4 pounds Kit includes the pumps which is equipped with internal safety relief valve Precision-ground 3-point punch/die sets with a capacity to 4-inch in 10-gauge mild or 16-gauge stainless steel