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Keystone Energy Tools LLC specializes in designing manufacturing and delivering oilfield tools. We offer different types of elevators. Bottleneck Bushing Type 250-ton and 350-ton are recommended when running slim-hole drill pipe. All Keystone elevators and parts are interchangeable with other corresponding designs. SJ series single-joint elevator is rated for 7.5 tons. The elevator can be bored to accommodate 18 degree tapered drill-pipe or square-shoulder casing & tubing. All Flappers are investment cast and then case hardened for wear resistance. Elastomers available are Nitrile Butadiene (NBR /Buna N) Hydrogen Nitrile Butadiene (HNBR) and Viton? (Fluoroelastomer / FKM).