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JENNMAR offers the industry’s most proven combination bolt system in the mining industry. The Combination Bolt is a two-piece bolt. The upper piece, available in additional combinations, consists of JENNMAR’s exclusive J-BAR® for better mixing, stronger threads, and greater anchorage capacity. The lower piece (a headed smooth bar) is connected to the top bolt by a coupler. The Combination Bolt provides ultimate tension in weak strata. The top portion (J-BAR) is encapsulated with resin, while the lower anchor is tensioned to the roof with our bearing plate.