1、After multi‑layer crystal diamond processing, the chemical performance is stable and corrosion resistant. 2、Hydraulic buffer door closer, the rotating shaft rotates softly, ensuring smooth opening and closing of the door. 3、The gears and shafts at both ends adopt multi‑layer quenching process, and surface hardness is above HRC80. 4、Using high‑hardness cast aluminum and cold‑rolled steel materials, strong and durable, wear‑resistant. 5、With high strength and rigidity, good toughness, high temperature resistance and high pressure resistance. 6、Adjustable telescopic arm, can be applied to a variety of door frames to meet your various needs. Condition: 100% Brand New Item Type: Solar Panel Kit Material: Cast Aluminum, Cold-Rolled Steel Color: Silver White Style: Modern and Simple Possess Function: Two-Stage Speed Adjustment Suitable Door Width for Small Size: 90cm / 35.4in, Suitable Door Weight: 45kg / 99.2lb Suitable Door Width for Medium Size: 110cm / 43.3in, Suitable Door Weight: 65kg / 143.3lb Weight: Approx. 893g-1059g / 31.5oz-37.4oz Type: S 45KG, M 65KG (Optional) Product Size: S 45KG Size: Approx. 14.3x21.9cm / 5.6x8.6in M 65KG Size: Approx. 17.7x24.2cm / 7.0x9.5in 1 x Telescopic Arm 1 x Main Body 1 x Bag of Accessories (8Pcs) 1 x Manual