MATERIAL: Extruded 6063 T6 aluminum alloy with selflubricating polyester thrust bearings.LENGTHS: 83″, 85″, 95″ and 120″ lengths standard for nominal door heights. Custom lengths are available.LOAD/FREQUENCY RATINGS: For 1-3/8″ 1-3/4″ doors standard; long barrel nuts available for 2″ 2-1/4″ doors. 48″ max. door width in 16 gauge hollow metal (min.) or 1/8″ aluminum (min.).Standard Duty Tested per BHMA standards for medium-frequency doors up to 200 lb. without frame or door reinforcement.Heavy Duty Tested per BHMA standards. Up to 200 lb. doors (high-frequency) and up to 400 lb. doors (medium-frequency) without frame or door reinforcement; up to 600 lb. doors (low-frequency) withthe use of Rivnuts in the frame.FINISHES: All SL21 hinges are stocked in Clear and Dark Bronze anodized aluminum. Custom anodizedor painted finishes are available. Product painted or anodized in the field voids the SELECT hinge warranty.CLOSERS: Conventional overhead surface, concealed sliding arm overhead or floor closers may be used with SELECT hinges. Pivot-type floor closers (with a fixed, conflicting center pivot) must be replaced.