Concealed heavy duty door closer

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 Certification: UL &CUL Listed, UL10C 3 Hours fire rating
 Spring Power: Size 2 to 4
 Durability: 500,000 cycles above
 Function: Adjustable Closing speed & Adjustable Latching speed
 Installation type: Concealed mount
 Pressure relief valve: Yes
 Max. Opening: 170 ° for size 2/3, 90°for size 4
 Mechanism: Rack & Pinion
 Hand of door: Non handed
 Materials of Body: Die Cast Aluminum
 Materials of guide rail and Main Arm: 6061, Steel
 Materials of Spring : 60Si2Mn
 Piston and Pinion: Heat treated, 20Cr
 Bearing: Full complement bearings for long durability
 Arm shaft width: 9 mm