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The RSIC-SI-FF 3/8″ BW, WW, BC and WC EZ is a full-frame spring and rubber isolator. This spring isolator can be attached by mid-wire to support the drywall grid below. The RSIC-SI-FF 3/8″ is one of the highest-performing rubber and spring isolators available for your noise control needs. The spring hanger uses a 3/8″ threaded rod and has 15 degrees of vertical alignment.