28-7U15-LB-10B Grade 2 Cylindrical Passage/Hall/Closet US10B Oil Rubbed Dark Bronze from Sargent Manufacturing - Cycle Test: Exceeds 2-1/2 times ANSI/ BHMA A156.2 Grade 2 cycle requirements. 5 Year limited warranty. No service required. Non-handed design for ease of installation and efficient warehousing. User friendly packaging, and user friendly instructions. Solid feel and precise lever action with solid one piece cast lever construction. Fits modified 161 door preps with internal through-bolts that supply strength and stability without requiring additional door preparation. Standard duty Commercial interior & exterior doors, Offices, Commercial interiors, Medical clinics, Government facilities, and Public buildings.