Profile: 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).