It adapts metal grid deck to eliminate sagging for comfort with 190cm long mattress,but the mounting depth is 84cm only. 

Standard size queen,full and twin.If you are using 2500#, this series are good to add value for your current styles.

Metal grid no sag design for sleeping comfort, and webbing in seat area for comfort sitting. 

Strong end tube in case people sits in the open position time to time.

Mattress 190cm long which is 8cm longer than traditional tubular sleeper mechanism.