GENTLY CLOSE DESIGN -- Excellent safety solution for heavy hinged lids, lids will lower slowly and gently to avoid smashing fingers | HOLDS LID OPEN -- These hinges will hold your lid open until you push it down. Never worry again about having to prop the lid open | STRONG ENOUGH -- Douper 200N heavy duty gas struts can support maximum 30lbs lid and lower gently; Weight support will be doubled with 2 hinges (60lbs/ 2pcs) | 75°-105° OPEN ANGLE -- Each lid hinge can be used for right or left hand mounting, keep the hinge installed for 75°-105° adjustable opening angles, depending on actual situation. Note: NO adjustments on placement measurements of the hinge mounted on side board. | WARM TIPS -- Douper hinges will not applicable with the lid at width more than 50” and height over 25”. And must with a 9 inch clearance. Hinges will not work if your lid doesn’t match specified dimension and weight requirement