For upward-opening flaps. Usable with pot and piano hinge hinges as well as hinge bands. Keeps the door in the fully open position. Opening angle 70° or 105°. Successfully tested for 30,000 opening/closing cycles. Closing speed adjustable. Note: This flap fitting is designed for specific flap weights. The table shows the application range for using one fitting per flap with a flap thickness of 20 mm. When using two fittings per flap, the flap width can be twice as wide if the flap height remains unchanged. For a different material thickness or weight, the door weight must comply with the following formula. Use 1 fitting per flap: 1/2 flap height (m) x flap weight (kg) x 9.8 = Min. 1.96 to Max. 6.86. Use 2 fittings per flap: 1/2 flap height (m) x flap weight (kg) x 9.8 = Min. 3.92 to Max. 13.72. Surface: nickel-plated. Type: NSDX - 20. Direction: left. Material: steel/zinc alloy. Brand: Lamp®. Contents (ST): 1.